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Note 3 - Acquisition (Details Textual) - USD ($)
$ in Millions
Dec. 19, 2018
Dec. 31, 2018
Dec. 31, 2013
King Bancorp Inc. [Member]      
Payments to Acquire Businesses, Gross $ 28.0    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total 195.0    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables 168.0    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits 126.0    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Common Equity Assumed $ 16.0    
THE BANCorp [Member]      
Business Acquisition, Percentage of Voting Interests Acquired     100.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   $ 1.1 $ 2.5