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Note 11 - Common Shares (Tables)
 12 Months Ended
Dec. 31, 2015
Stockholders' Equity Note [Abstract]  
Share Repurchases [Table Text Block]
   

Year Ended December 31,

 
   

2015

   

2014

   

2013

 

Common stock repurchased on the open market or through tender offer

                       

Number of shares

    1,062,456       79,392       1,064,299  

Aggregate market value of shares (in thousands)

  $ 23,616     $ 1,182     $ 6,538  

Average price per share

  $ 22.23     $ 14.89     $ 6.14  
                         

Common stock received in connection with share-based compensation

                       

Number of shares

    99,675       —       —  

Aggregate market value of shares (in thousands)

  $ 2,335     $ —     $ —  

Average price per share

  $ 23.42     $ —     $ —