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Note 4 - Debt Securities - Debt Securities Available-for-sale (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Due in one year or less, Amortized cost $ 44,983,000  
Due in one year or less, Estimated fair value 45,329,000  
Due after one year through five years, Amortized cost 242,363,000  
Due after one year through five years, Estimated fair value 251,324,000  
Due after five years through ten years, Amortized cost 237,913,000  
Due after five years through ten years, Estimated fair value 247,562,000  
Due after ten years, Amortized cost 50,377,000  
Due after ten years, Estimated fair value 52,784,000  
Total, amortized cost 575,636,000 $ 474,357,000
Securities available-for-sale $ 596,999,072 $ 479,843,448