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Note 7 - Debt and Equity Securities - Debt Securities Available-for-sale (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Due in one year or less, Amortized cost $ 64,579,000  
Due in one year or less, Estimated fair value 64,569,000  
Due after one year through five years, Amortized cost 243,384,000  
Due after one year through five years, Estimated fair value 248,125,000  
Due after five years through ten years, Amortized cost 138,192,000  
Due after five years through ten years, Estimated fair value 140,093,000  
Due after ten years, Amortized cost 37,178,000  
Due after ten years, Estimated fair value 36,517,000  
Total, amortized cost 483,333,000 $ 474,357,000
Securities available-for-sale $ 489,303,666 $ 479,843,448