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Note 5 - Share-based Compensation (Tables)
3 Months Ended
Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
   

Number of Shares

Awarded

   

Weighted Average
Grant Date

Fair Value

 

Non-vested at December 31, 2015

    55,854     $ 12.83  

Granted

    58,084       15.25  

Non-vested at March 31, 2016

    113,938     $ 14.06