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Note 2 - Securities (Details Textual)
$ in Thousands
 12 Months Ended
Jan. 01, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Weighted Average Re-pricing Term (Year)   3 years 6 months 3 years 8 months 12 days
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale, Total   $ 34,057 $ 22,031
Debt Securities, Available-for-sale, Realized Gain   40 1
Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities   3,300 2,200
Proceeds from Sale of Held-to-maturity Securities   0 0
Debt Securities, Held-to-maturity, Fair Value, Total   14,743 17,646
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax   0 (431)
Debt Securities, Available-for-sale, Restricted   66,500 40,500
Impairment Losses Related to Federal Home Loan Stock   0  
Other Assets [Member]      
Equity Securities without Readily Determinable Fair Value, Amount   $ 529 $ 514
Accounting Standards Update 2017-12 [Member]      
Debt Securities, Held-to-maturity, Fair Value, Total $ (23,000)    
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax $ 431    
US Agency and Mortgage-backed Securities [Member]      
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions   7 42
Available-for-Sale Securities, Number of Securities   100 94
Debt Securities, Held-to-maturity, Fair Value, Total   $ 9,852 $ 12,454
Municipal Bonds [Member]      
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions   1 3
Available-for-Sale Securities, Number of Securities   84 79
Debt Securities, Held-to-maturity, Fair Value, Total   $ 3,286 $ 3,680