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Note 9 - Borrowing Arrangements (Details Textual) - USD ($)
Oct. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available   $ 229,464,000  
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   367,188,000  
Federal Home Loan Bank Stock   3,517,000 $ 3,027,000
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds   130,241,000  
Additional Federal Home Loan Bank Stock to Be Purcased   2,679,000  
Advances from Federal Home Loan Banks, Total   0 0
Loans Payable [Member]      
Debt Instrument, Term 1 year    
Debt Instrument, Covenant, Maximum Debt Outstanding $ 5,000,000    
Notes Payable, Total   0 $ 0
Debt Instrument, Secured by Stock, Number of Shares 100    
Lender Bank One [Member]      
Unsecured Short-term Borrowing Agreement, Amount Available for Borrowing   20,000,000  
Lender Bank Two [Member]      
Unsecured Short-term Borrowing Agreement, Amount Available for Borrowing   11,000,000  
Lender Bank Three [Member]      
Unsecured Short-term Borrowing Agreement, Amount Available for Borrowing   $ 10,000,000