Note 6 - Other Borrowings (Details Textual) - USD ($) Pure in Thousands, $ in Millions  | 
May 21, 2021  | 
Mar. 31, 2022  | 
Dec. 31, 2021  | 
|---|---|---|---|
| Proceeds from FHLBank Borrowings, Financing Activities | $ 5.0 | ||
| Federal Home Loan Bank, Advances, Interest Rate | 0.00% | ||
| Payments of FHLBank Borrowings, Financing Activities | $ 4.0 | ||
| Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available | $ 62.0 | $ 60.8 | |
| Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | $ 78.4 | $ 76.8 | 
| X | ||||||||||
- Definition Amount of the collateral pledged in support of federal home loan bank advances outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
- Definition Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
- Definition Interest rate of advances made and reported by Federal Home Loan Bank (FHLBank). No definition available. 
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| X | ||||||||||
- Definition Amount of cash inflow from Federal Home Loan Bank (FHLBank) borrowing, classified as financing activity. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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| X | ||||||||||
- Definition Amount of cash outflow for repayment of Federal Home Loan Bank (FHLBank) borrowing, classified as financing activity. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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