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Note 12 - Share-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
   

Number of Shares Awarded (1)

      Weighted Average Grant Date Fair Value (1)   
                 

Non-vested at December 31, 2012

    4,456       17.30  

2013 Granted

    32,964       12.40  

Vested

    (9,238 )     14.10  

Non-vested at December 31, 2013

    28,182     $ 12.60  

2014 Granted

    73,558       13.21  

Vested

    (22,532 )     11.76  

Non-vested at December 31, 2014

    79,208     $ 12.79