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Note 10 - Intangible Assets - Core Deposit Intangible Assets Activity (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Beginning intangible assets, net     $ 3,959,260  
Amortization $ (215,575) $ (124,243) (650,021) $ (427,221)
Ending intangible assets, net 3,309,239   3,309,239  
Core Deposits [Member]        
Beginning intangible assets, net 3,525,000 2,375,000 3,959,000 2,678,000
Amortization (216,000) (124,000) (650,000) (427,000)
Ending intangible assets, net $ 3,309,000 $ 2,251,000 $ 3,309,000 $ 2,251,000