Note 4 - Allowance for Loan Losses (Details Textual) $ in Thousands  | 
21 Months Ended | |
|---|---|---|
| 
 Dec. 31, 2021  
USD ($) 
 | 
 Dec. 31, 2020  
USD ($) 
 | 
|
| Financing Receivable, Troubled Debt Restructuring | $ 0 | $ 0 | 
| Financing Receivable, Number of Payment Deferrals | 50 | |
| Financing Receivable, Deferred Payments | $ 9,700 | |
| SBA CARES Act Paycheck Protection Program [Member] | ||
| Payments to Acquire Loans Receivable | $ 1,300 | 
| X | ||||||||||
- Definition Deferred amounts of payments on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19. No definition available. 
  | 
| X | ||||||||||
- Definition Number of payment deferrals on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19. No definition available. 
  | 
| X | ||||||||||
- Definition Amount of financing receivable modified as troubled debt restructuring. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
  | 
| X | ||||||||||
- Definition The cash outflow for the purchase of loan receivable arising from the financing of goods and services. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
  | 
| X | ||||||||||
- Details 
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