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Note 10 - Intangible Assets - Core Deposit Intangible Assets Activity (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Beginning intangible assets, net $ 3,959,260  
Amortization (217,223) $ (163,664)
Ending intangible assets, net 3,742,037  
Core Deposits [Member]    
Beginning intangible assets, net 3,959,000 2,678,000
Purchase
Amortization (217,000) (164,000)
Ending intangible assets, net $ 3,742,000 $ 2,514,000