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Note 12 - Borrowings (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Federal Home Loan Bank Percentage of Fair Value of Collateral 35.00%    
Notes Payable, Total $ 11,200,000 $ 5,000,000  
Proceeds from Issuance of Long-term Debt, Total 7,450,000 5,000,000
Notes Payable to Banks [Member]      
Notes Payable, Total   5,000,000  
Proceeds from Issuance of Long-term Debt, Total $ 11,200,000    
Debt Instrument, Interest Rate, Effective Percentage 4.24%    
Notes Payable to Banks [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate 2.50%    
Line of Credit [Member]      
Line of Credit Facility, Maximum Borrowing Capacity $ 3,000,000    
Proceeds from Lines of Credit, Total $ 0    
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate 2.50%    
Federal Home Loan Bank [Member]      
Line of Credit Facility, Remaining Borrowing Capacity $ 133,300,000    
Federal Reserve Bank Borrowings [Member]      
Line of Credit Facility, Remaining Borrowing Capacity 57,300,000    
Long-term Line of Credit, Total $ 0 $ 0  
Mortgage Loans Freeof Other Pledges Liensand Encumbrances [Member]      
Federal Home Loan Bank Percentage of Fair Value of Collateral 80.00%    
Investment Securities Freeof Other Pledges Liensand Encumbrances [Member]      
Federal Home Loan Bank Percentage of Fair Value of Collateral 95.00%