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Note 17 - Stock-based Compensation Plan (Tables)
12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
    Number of Shares   Weighted Average Grant-Date Fair Value
         
Nonvested at beginning of year     -     $ -  
Granted     19,500       24.50  
Vested     (500 )     24.50  
Forfeited     (1,000 )     24.50  
                 
Nonvested at end of year     18,000     $ 24.50