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Note 10 - Intangible Assets - Estimated Remaining Amortization Expense on Intangible Assets on Core Deposits (Details) - USD ($)
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Total $ 3,524,814   $ 3,959,260      
Core Deposits [Member]            
2020 392,000          
2021 628,000          
2022 574,000          
2023 502,000          
2024 337,000          
2025 301,000          
After 791,000          
Total $ 3,525,000 $ 3,742,000 $ 3,959,000 $ 2,375,000 $ 2,514,000 $ 2,678,000