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Note 7 - Debt Securities - Debt Securities Available-for-sale (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Due in one year or less, Amortized cost $ 46,260,000  
Due in one year or less, Estimated fair value 46,694,000  
Due after one year through five years, Amortized cost 226,833,000  
Due after one year through five years, Estimated fair value 236,081,000  
Due after five years through ten years, Amortized cost 211,689,000  
Due after five years through ten years, Estimated fair value 220,972,000  
Due after ten years, Amortized cost 43,384,000  
Due after ten years, Estimated fair value 45,071,000  
Total, amortized cost 528,166,000 $ 474,357,000
Securities available-for-sale $ 548,817,733 $ 479,843,448