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Note 11 - Subordinated Capital Note (Details Textual) - USD ($)
12 Months Ended
Jul. 23, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Proceeds from Issuance of Subordinated Long-term Debt   $ 17,000,000
Contribution to Tier One Capital $ 10,000,000 10,000,000    
Senior Notes [Member]        
Early Repayment of Senior Debt 5,000,000 $ 5,000,000    
Ten Year Subordinated Debt Note, Issued July 23, 2019 [Member]        
Proceeds from Issuance of Subordinated Long-term Debt $ 17,000,000      
Debt Instrument, Term 10 years      
Debt Instrument, Fixed Rate for First Five Years 5.75%