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Note 18 - Supplemental Information (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Allowance for Credit Losses on Financing Receivables [Table Text Block]
   
2016
    
2015
    
2014
  
Balance at beginning of period
   $
2,138
     $
1,887
     $
1,753
  
Bad debt expense
    
1,089
      
268
      
272
  
Net recoveries (write-offs)
    
(635
)
    
(8
)
    
(138
)
Effect of foreign currency translation
    
(1
)
    
(9
)
    
—
  
Balance at end of period
   $
2,591
     $
2,138
     $
1,887