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Note 12 - Derivative Financial Instruments (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 05, 2016
Jun. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Apr. 01, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax   $ 151 $ 151 $ (1,277)  
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]          
Accumulated Other Comprehensive Income (Loss), Net of Tax   200 200 $ 200  
FUSB [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]          
Derivative, Notional Amount         $ 10,000
Derivative, Term of Contract 7 years        
Derivative, Fixed Interest Rate 1.46%        
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net   $ 0 $ 0