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Note 9 - Regulatory Matters Subsequent Event (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Apr. 24, 2019
Feb. 08, 2019
Mar. 31, 2019
Mar. 31, 2018
Stock Issued During Period, Shares, New Issues   3,285,550    
Shares Issued, Price Per Share   $ 7    
Shares Issued, Underwriting Discount Per Share   $ 0.35    
Proceeds from Issuance of Common Stock   $ 21,300 $ 21,316 $ 59
Common Stock, Dividends, Per Share, Declared     $ 0.05 $ 0.04
Stock Issued During Period, Shares, Dividend Reinvestment Plan     1,640 8,637
Subsequent Event [Member]        
Common Stock, Dividends, Per Share, Declared $ 0.05      
Dividends Payable, Date to be Paid Jun. 17, 2019      
Dividends Payable, Date of Record Jun. 03, 2019      
FNCB Bank [Member]        
Payments for Capital Investment in Wholly Owned Subsidiary     $ 17,800  
Over-Allotment Option [Member]        
Stock Issued During Period, Shares, New Issues   428,550