Note 4 - Allowance for Loan Losses (Tables)
   | 
12 Months Ended | 
Dec. 31, 2021  | 
| Notes Tables | 
 
 | 
| Financing Receivable, Allowance for Credit Loss [Table Text Block] | 
    
|   | 
  | 
  December 31, 2021   | 
  | 
 
|   | 
  | 
  1-4 family residential   | 
  | 
  | 
  Multi-family   | 
  | 
  | 
  Commercial   | 
  | 
  | 
  Consumer   | 
  | 
  | 
  Total   | 
  | 
 
|   | 
  | 
  (Dollars in thousands)   | 
  | 
 
|   Year ended:   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   Beginning balance   | 
  | 
$ | 
798 | 
  | 
  | 
  | 
29 | 
  | 
  | 
  | 
38 | 
  | 
  | 
  | 
5 | 
  | 
  | 
$ | 
870 | 
  | 
 
|   Charge-offs   | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
(99 | 
) | 
  | 
  | 
(99 | 
) | 
 
|   Recoveries   | 
  | 
  | 
31 | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
31 | 
  | 
 
|   Net recoveries (charge-offs)   | 
  | 
  | 
31 | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
(99 | 
) | 
  | 
  | 
(68 | 
) | 
 
|   Provision for loan losses   | 
  | 
  | 
(154 | 
) | 
  | 
  | 
40 | 
  | 
  | 
  | 
(13 | 
) | 
  | 
  | 
104 | 
  | 
  | 
  | 
(23 | 
) | 
 
|   Ending balance   | 
  | 
$ | 
675 | 
  | 
  | 
  | 
69 | 
  | 
  | 
  | 
25 | 
  | 
  | 
  | 
10 | 
  | 
  | 
$ | 
779 | 
  | 
 
 
    
|   | 
  | 
  December 31, 2020   | 
  | 
 
|   | 
  | 
  1-4 family residential   | 
  | 
  | 
  Multi-family   | 
  | 
  | 
  Commercial   | 
  | 
  | 
  Consumer   | 
  | 
  | 
  Total   | 
  | 
 
|   | 
  | 
(Dollars in thousands) | 
  | 
 
|   Year ended:   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   Beginning balance   | 
  | 
$ | 
362 | 
  | 
  | 
  | 
10 | 
  | 
  | 
  | 
9 | 
  | 
  | 
  | 
8 | 
  | 
  | 
$ | 
389 | 
  | 
 
|   Charge-offs   | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
 
|   Recoveries   | 
  | 
  | 
17 | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
17 | 
  | 
 
|   Net recoveries (charge-offs)   | 
  | 
  | 
17 | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
17 | 
  | 
 
|   Provision for loan losses   | 
  | 
  | 
419 | 
  | 
  | 
  | 
19 | 
  | 
  | 
  | 
29 | 
  | 
  | 
  | 
(3 | 
) | 
  | 
  | 
464 | 
  | 
 
|   Ending balance   | 
  | 
$ | 
798 | 
  | 
  | 
  | 
29 | 
  | 
  | 
  | 
38 | 
  | 
  | 
  | 
5 | 
  | 
  | 
$ | 
870 | 
  | 
 
 
    
|   | 
  | 
  Collectively evaluated   | 
  | 
  | 
  Individually evaluated   | 
  | 
  | 
  Total   | 
  | 
 
|   | 
  | 
  Allowance for loan losses   | 
  | 
  | 
  Recorded investment in loans   | 
  | 
  | 
  Allowance for loan losses   | 
  | 
  | 
  Recorded investment in loans   | 
  | 
  | 
  Allowance for loan losses   | 
  | 
  | 
  Recorded investment in loans   | 
  | 
 
|   | 
  | 
  | 
(Dollars in thousands) | 
 
|   December 31, 2021   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   1-4 family residential   | 
  | 
$ | 
557 | 
  | 
  | 
$ | 
86,892 | 
  | 
  | 
$ | 
118 | 
  | 
  | 
$ | 
1,136 | 
  | 
  | 
$ | 
675 | 
  | 
  | 
$ | 
88,028 | 
  | 
 
|   Multi-family   | 
  | 
  | 
69 | 
  | 
  | 
  | 
3,497 | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
69 | 
  | 
  | 
  | 
3,497 | 
  | 
 
|   Commercial   | 
  | 
  | 
25 | 
  | 
  | 
  | 
4,604 | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
25 | 
  | 
  | 
  | 
4,604 | 
  | 
 
|   Consumer   | 
  | 
  | 
10 | 
  | 
  | 
  | 
372 | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
10 | 
  | 
  | 
  | 
372 | 
  | 
 
|   Total   | 
  | 
$ | 
661 | 
  | 
  | 
$ | 
95,365 | 
  | 
  | 
$ | 
118 | 
  | 
  | 
$ | 
1,136 | 
  | 
  | 
$ | 
779 | 
  | 
  | 
$ | 
96,501 | 
  | 
 
|   December 31, 2020   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   1-4 family residential   | 
  | 
$ | 
648 | 
  | 
  | 
$ | 
84,775 | 
  | 
  | 
$ | 
150 | 
  | 
  | 
$ | 
2,423 | 
  | 
  | 
$ | 
798 | 
  | 
  | 
$ | 
87,198 | 
  | 
 
|   Multi-family   | 
  | 
  | 
29 | 
  | 
  | 
  | 
5,736 | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
29 | 
  | 
  | 
  | 
5,736 | 
  | 
 
|   Commercial   | 
  | 
  | 
38 | 
  | 
  | 
  | 
5,340 | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
38 | 
  | 
  | 
  | 
5,340 | 
  | 
 
|   Consumer   | 
  | 
  | 
5 | 
  | 
  | 
  | 
286 | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
99 | 
  | 
  | 
  | 
5 | 
  | 
  | 
  | 
385 | 
  | 
 
|   Total   | 
  | 
$ | 
720 | 
  | 
  | 
$ | 
96,137 | 
  | 
  | 
$ | 
150 | 
  | 
  | 
$ | 
2,522 | 
  | 
  | 
$ | 
870 | 
  | 
  | 
$ | 
98,659 | 
  | 
 
 
   
 | 
| Financing Receivable Credit Quality Indicators [Table Text Block] | 
    
|   | 
  | 
  | 
  | 
  | 
  | 
Special | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  Pass   | 
  | 
  | 
  Mention   | 
  | 
  | 
  Substandard   | 
  | 
  | 
  Doubtful   | 
  | 
  | 
  Total loans   | 
  | 
 
|   | 
  | 
  | 
(Dollars in thousands) | 
 
|   December 31, 2021   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   1-4 family residential   | 
  | 
$ | 
87,881 | 
  | 
  | 
$ | 
45 | 
  | 
  | 
$ | 
102 | 
  | 
  | 
$ | 
— | 
  | 
  | 
$ | 
88,028 | 
  | 
 
|   Multi-family   | 
  | 
  | 
3,497 | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
3,497 | 
  | 
 
|   Commercial   | 
  | 
  | 
4,604 | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
4,604 | 
  | 
 
|   Consumer   | 
  | 
  | 
372 | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
372 | 
  | 
 
|   Total   | 
  | 
$ | 
96,354 | 
  | 
  | 
$ | 
45 | 
  | 
  | 
$ | 
102 | 
  | 
  | 
$ | 
— | 
  | 
  | 
$ | 
96,501 | 
  | 
 
|   December 31, 2020   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   1-4 family residential   | 
  | 
$ | 
86,501 | 
  | 
  | 
$ | 
417 | 
  | 
  | 
$ | 
280 | 
  | 
  | 
$ | 
— | 
  | 
  | 
$ | 
87,198 | 
  | 
 
|   Multi-family   | 
  | 
  | 
5,736 | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
5,736 | 
  | 
 
|   Commercial   | 
  | 
  | 
5,340 | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
5,340 | 
  | 
 
|   Consumer   | 
  | 
  | 
286 | 
  | 
  | 
  | 
99 | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
385 | 
  | 
 
|   Total   | 
  | 
$ | 
97,863 | 
  | 
  | 
$ | 
516 | 
  | 
  | 
$ | 
280 | 
  | 
  | 
$ | 
— | 
  | 
  | 
$ | 
98,659 | 
  | 
 
 
   
 | 
| Financing Receivable, Past Due [Table Text Block] | 
    
|   | 
  | 
31-89 Days Past Due and Accruing | 
  | 
  | 
Greater than 90 Days Past Due and Accruing | 
  | 
  | 
  Non-Accrual   | 
  | 
  | 
  Total Past Due and Non-Accrual   | 
  | 
  | 
  Current   | 
  | 
  | 
  Total Loan Balance   | 
  | 
 
|   | 
  | 
  | 
(Dollars in thousands) | 
  | 
 
|   December 31, 2021   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   1-4 family residential   | 
  | 
$ | 
— | 
  | 
  | 
$ | 
41 | 
  | 
  | 
$ | 
102 | 
  | 
  | 
$ | 
143 | 
  | 
  | 
$ | 
87,885 | 
  | 
  | 
$ | 
88,028 | 
  | 
 
|   Multi-family   | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
3,497 | 
  | 
  | 
  | 
3,497 | 
  | 
 
|   Commercial   | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
4,604 | 
  | 
  | 
  | 
4,604 | 
  | 
 
|   Consumer   | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
372 | 
  | 
  | 
  | 
372 | 
  | 
 
|   Total   | 
  | 
$ | 
— | 
  | 
  | 
$ | 
41 | 
  | 
  | 
$ | 
102 | 
  | 
  | 
$ | 
143 | 
  | 
  | 
$ | 
96,358 | 
  | 
  | 
$ | 
96,501 | 
  | 
 
|   December 31, 2020   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   1-4 family residential   | 
  | 
$ | 
— | 
  | 
  | 
$ | 
75 | 
  | 
  | 
$ | 
280 | 
  | 
  | 
$ | 
355 | 
  | 
  | 
$ | 
86,843 | 
  | 
  | 
$ | 
87,198 | 
  | 
 
|   Multi-family   | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
5,736 | 
  | 
  | 
  | 
5,736 | 
  | 
 
|   Commercial   | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
5,340 | 
  | 
  | 
  | 
5,340 | 
  | 
 
|   Consumer   | 
  | 
  | 
99 | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
99 | 
  | 
  | 
  | 
286 | 
  | 
  | 
  | 
385 | 
  | 
 
|   Total   | 
  | 
$ | 
99 | 
  | 
  | 
$ | 
75 | 
  | 
  | 
$ | 
280 | 
  | 
  | 
$ | 
454 | 
  | 
  | 
$ | 
98,205 | 
  | 
  | 
$ | 
98,659 | 
  | 
 
 
   
 | 
| Impaired Financing Receivables [Table Text Block] | 
    
|   | 
  | 
  Recorded investment   | 
  | 
  | 
Unpaid principal balance | 
  | 
  | 
  Related allowance   | 
  | 
  | 
  Average recorded investment   | 
  | 
  | 
Interest income recognized | 
  | 
 
|   | 
  | 
  | 
(Dollars in thousands) | 
 
|   December 31, 2021   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   With no related allowance recorded   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   1-4 family residential   | 
  | 
$ | 
355 | 
  | 
  | 
$ | 
595 | 
  | 
  | 
$ | 
— | 
  | 
  | 
$ | 
348 | 
  | 
  | 
$ | 
26 | 
  | 
 
|   Multi-family   | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
 
|   Commercial   | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
 
|   Consumer   | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
 
|   Total   | 
  | 
$ | 
355 | 
  | 
  | 
$ | 
595 | 
  | 
  | 
$ | 
— | 
  | 
  | 
$ | 
348 | 
  | 
  | 
$ | 
26 | 
  | 
 
|   With a related allowance recorded   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   1-4 family residential   | 
  | 
$ | 
781 | 
  | 
  | 
$ | 
797 | 
  | 
  | 
$ | 
118 | 
  | 
  | 
$ | 
797 | 
  | 
  | 
$ | 
35 | 
  | 
 
|   Multi-family   | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
 
|   Commercial   | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
 
|   Consumer   | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
 
|   Total   | 
  | 
$ | 
781 | 
  | 
  | 
$ | 
797 | 
  | 
  | 
$ | 
118 | 
  | 
  | 
$ | 
797 | 
  | 
  | 
$ | 
35 | 
  | 
 
|   Total individually assessed as of December 31, 2021   | 
  | 
$ | 
1,136 | 
  | 
  | 
$ | 
1,392 | 
  | 
  | 
$ | 
118 | 
  | 
  | 
$ | 
1,145 | 
  | 
  | 
$ | 
61 | 
  | 
 
|   December 31, 2020   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   With no related allowance recorded   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   1-4 family residential   | 
  | 
$ | 
1,348 | 
  | 
  | 
$ | 
1,676 | 
  | 
  | 
$ | 
— | 
  | 
  | 
$ | 
1,382 | 
  | 
  | 
$ | 
73 | 
  | 
 
|   Multi-family   | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
 
|   Commercial   | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
 
|   Consumer   | 
  | 
  | 
99 | 
  | 
  | 
  | 
99 | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
89 | 
  | 
  | 
  | 
6 | 
  | 
 
|   Total   | 
  | 
$ | 
1,447 | 
  | 
  | 
$ | 
1,775 | 
  | 
  | 
$ | 
— | 
  | 
  | 
$ | 
1,471 | 
  | 
  | 
$ | 
79 | 
  | 
 
|   With a related allowance recorded   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   1-4 family residential   | 
  | 
$ | 
1,075 | 
  | 
  | 
$ | 
1,120 | 
  | 
  | 
$ | 
150 | 
  | 
  | 
$ | 
1,104 | 
  | 
  | 
$ | 
51 | 
  | 
 
|   Multi-family   | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
 
|   Commercial   | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
 
|   Consumer   | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
  | 
  | 
— | 
  | 
 
|   Total   | 
  | 
$ | 
1,075 | 
  | 
  | 
$ | 
1,120 | 
  | 
  | 
$ | 
150 | 
  | 
  | 
$ | 
1,104 | 
  | 
  | 
$ | 
51 | 
  | 
 
|   Total individually assessed as of December 31, 2020   | 
  | 
$ | 
2,522 | 
  | 
  | 
$ | 
2,895 | 
  | 
  | 
$ | 
150 | 
  | 
  | 
$ | 
2,575 | 
  | 
  | 
$ | 
130 | 
  | 
 
 
   
 |