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Note 6 - Goodwill and Other Intangible Assets (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Apr. 02, 2018
Dec. 31, 2017
Goodwill, Ending Balance   $ 1,434,982  
Hometown Bancshares, Inc. [Member]        
Goodwill, Ending Balance   $ 1,434,982 $ 1,435,000  
Hometown Bancshares, Inc. [Member] | Core Deposits [Member]        
Finite-Lived Intangible Asset, Useful Life   7 years    
Finite-lived Intangible Assets Acquired $ 3,500,000