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Note 2 - Securities - Debt Securities by Maturity (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Due in one year or less, weighted average yield 2.52%  
Due in one year or less, amortized cost $ 5,906,000  
Due in one year or less, fair value $ 5,939,000  
Due from one to five years, weighted average yield 1.16%  
Due from one to five years, amortized cost $ 93,320,000  
Due from one to five years, fair value $ 94,474,000  
Due from five to ten years, weighted average yield 1.67%  
Due from five to ten years, amortized cost $ 176,848,000  
Due from five to ten years, fair value $ 180,541,000  
Due after ten years, weighted average yield 2.07%  
Due after ten years, amortized cost $ 79,960,000  
Due after ten years, fair value $ 81,003,000  
Weighted average yield 1.67%  
Amortized cost $ 380,403,000 $ 329,979,000
Fair value $ 387,347,000 334,655,000
Collateralized Mortgage Backed Securities [Member]    
No single maturity, weighted average yield 2.10%  
No single maturity, amortized cost $ 23,869,000  
No single maturity, fair value 24,890,000  
Amortized cost 23,869,000 41,998,000
Fair value $ 24,890,000 42,470,000
Other Debt and Equity Securities [Member]    
No single maturity, weighted average yield 4.13%  
No single maturity, amortized cost $ 500,000  
No single maturity, fair value 500,000  
Amortized cost 500,000 500,000
Fair value $ 500,000 $ 500,000