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Note 8 - Borrowings (Details Textual) - USD ($)
$ in Millions
Aug. 05, 2014
Dec. 31, 2015
Aug. 30, 2010
Subordinated Debt [Member] | Director [Member]      
Debt Instrument, Face Amount     $ 9.3
Subordinated Debt [Member]      
Debt Instrument, Face Amount $ 70.0    
Debt Instrument, Interest Rate, Stated Percentage 5.75%    
Payments of Debt Issuance Costs $ 1.2    
Debt Instrument, Repurchase Amount   $ 9.3  
Proceeds from Issuance of Subordinated Long-term Debt $ 68.8