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Note 7 - Deposits (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Time Deposits, at or Above FDIC Insurance Limit $ 13,228,000 $ 15,568,000  
Interest Expense, Time Deposits, Above FDIC Insurance Limit 186,000 239,000 $ 120,000
Time Deposits, Total 152,331,000    
Time Deposit Maturities, Year One 109,109,000    
Time Deposit Maturities, Year Two 35,287,000    
Time Deposit Maturities, Year Three 4,011,000    
Time Deposit Maturities, Year Four 2,199,000    
Time Deposit Maturities, Year Five 1,634,000    
Time Deposit Maturities, after Year Five 91,000    
Related Party Deposit Liabilities $ 6,900,000 $ 5,536,000