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Note 2 - Securities - Debt Securities by Maturity (Details) - USD ($)
Mar. 31, 2022
Dec. 31, 2021
Due in 2022, Weighted Average Yield 1.98%  
Due in 2022, Amortized Cost $ 10,171,000  
Due in 2022, Fair Value $ 10,171,000  
Due in 2023 through 2027, Weighted Average Yield 1.11%  
Due in 2023 through 2027, Amortized Cost $ 263,429,000  
Due in 2023 through 2027, Fair Value $ 251,105,000  
Due in 2028 through 2032, Weighted Average Yield 1.74%  
Due in 2028 through 2032, Amortized Cost $ 295,377,000  
Due in 2028 through 2032, Fair Value $ 273,366,000  
Due in 2033 and beyond, Weighted Average Yield 2.13%  
Due in 2033 and beyond, Amortized Cost $ 36,339,000  
Due in 2033 and beyond, Fair Value $ 32,773,000  
Total available for sale securities, weighted average yield 1.52%  
Total available for sale securities, Amortized Cost $ 646,031,000 $ 597,463,000
Securities available for sale $ 605,661,000 592,743,000
Collateralized Mortgage-Backed Securities [Member]    
No single maturity, weighted average yield 1.95%  
No single maturity, amortized cost $ 40,215,000  
No single maturity, fair value 37,746,000  
Total available for sale securities, Amortized Cost 40,215,000 41,906,000
Securities available for sale $ 37,746,000 41,803,000
Other Debt and Equity Securities [Member]    
No single maturity, weighted average yield 3.75%  
No single maturity, amortized cost $ 500,000  
No single maturity, fair value 500,000  
Total available for sale securities, Amortized Cost 500,000 500,000
Securities available for sale $ 500,000 $ 500,000