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Note 2 - Securities (Details Textual)
$ in Thousands
 9 Months Ended 12 Months Ended
Jan. 01, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Weighted Average Re-pricing Term (Year)   3 years 1 month 6 days   3 years 8 months 12 days
Debt Securities, Held-to-maturity, Fair Value, Total   $ 15,638   $ 17,646 [1]
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax   0 $ (431)  
Impairment Losses Related to Federal Home Loan Stock   0    
Other Assets [Member]        
Equity Securities without Readily Determinable Fair Value, Amount   $ 497   $ 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]        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total   1   42
Available-for-Sale Securities, Number of Securities   93   94
Debt Securities, Held-to-maturity, Fair Value, Total   $ 10,752   $ 12,454
Municipal Bonds [Member]        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total       3
Available-for-Sale Securities, Number of Securities       79
Debt Securities, Held-to-maturity, Fair Value, Total   $ 3,301   $ 3,680
[1] Derived from audited consolidated financial statements.