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Note 7 - Debt Securities - Debt Securities Available-for-sale (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Due in one year or less, Amortized cost $ 48,856,000  
Due in one year or less, Estimated fair value 49,216,000  
Due after one year through five years, Amortized cost 234,542,000  
Due after one year through five years, Estimated fair value 243,595,000  
Due after five years through ten years, Amortized cost 181,220,000  
Due after five years through ten years, Estimated fair value 189,531,000  
Due after ten years, Amortized cost 30,341,000  
Due after ten years, Estimated fair value 31,274,000  
Total, amortized cost 494,959,000 $ 474,357,000
Securities available-for-sale $ 513,615,814 $ 479,843,448