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Note 13 - Common Shares (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Share Repurchases [Table Text Block]
   
Year Ended December 31,
  
   
2019
    
2018
    
2017
  
Common stock repurchased on the open market or through tender offer
                        
Number of shares
    
101,816
      
-
      
-
  
Aggregate market value of shares (in thousands)
   $
4,986
     $
-
     $
-
  
Average price per share
   $
48.97
     $
-
     $
-
  
                         
Common stock received in connection with share-based compensation
                        
Number of shares
    
21,332
      
19,777
      
50,454
  
Aggregate market value of shares (in thousands)
   $
1,510
     $
1,138
     $
2,602
  
Average price per share
   $
70.77
     $
57.56
     $
51.58