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Note 10 - Borrowings (Details Textual) - USD ($)
Jun. 11, 2021
Mar. 31, 2022
Dec. 31, 2021
Line of Credit Facility, Maximum Borrowing Capacity $ 4,000,000    
Advance from Federal Home Loan Bank, Total   $ 0 $ 3,000,000
Line of Credit [Member]      
Debt Instrument, Term (Year) 5 years    
Long-Term Line of Credit, Total   $ 0 $ 0