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Note 18 - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Valuation and Qualifying Accounts [Table Text Block]
   
Balance at
Beginning of
Yea
r
    
Additions
Charged to
Earning
s
    
Charges to
Reserve, Net (1
)
    
Reserves
Established for
Acquisition
s
    
Balance at End
of Yea
r
  
Year ended December 31, 201
7
                                        
Allowance for doubtful account
s
   $
5,642
     $
346
     $
(1,842
 )   $
659
     $
4,805
  
Reserves for inventor
y
    
13,031
      
6,164
      
(4,036
 )    
828
      
15,987
  
Valuation of deferred tax asset
s
    
4,362
      
2,455
      
-
      
-
      
6,817
  
                                         
Year ended December 31, 201
6
                                        
Allowance for doubtful account
s
   $
2,494
     $
1,654
     $
(1,110
 )   $
2,604
     $
5,642
  
Reserves for inventor
y
    
10,582
      
5,359
      
(5,357
 )    
2,447
      
13,031
  
Valuation of deferred tax asset
s
    
1,523
      
638
      
-
      
2,201
      
4,362
  
                                         
Year ended December 31, 201
5
                                        
Allowance for doubtful account
s
   $
2,275
     $
481
     $
(325
 )   $
63
     $
2,494
  
Reserves for inventor
y
    
9,387
      
3,739
      
(3,158
 )    
614
      
10,582
  
Valuation of deferred tax asset
s
    
1,385
      
138
      
-
      
-
      
1,523