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Note 6 - Goodwill and Intangibles - Estimated Amortization Expense of Core Deposit Intangible (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net book value $ 9,078,953 $ 7,381,213 $ 1,471,409
Core Deposits [Member]      
2018 1,218,202    
2019 1,196,331    
2020 1,169,934    
2021 1,139,012    
2022 1,103,565    
Thereafter 3,251,909    
Net book value $ 9,078,953 $ 7,381,213 $ 1,471,410