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Note 8 - Federal Home Loan Bank Advances - Required Future Principal Payments (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
2020 $ 8,250,000  
2021 5,828,000  
2022 4,658,000  
2023 3,929,000  
2024 948,000  
Thereafter 0  
Total $ 23,613,000 $ 0