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Note 18 - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
18.
Valuation and Qualifying Accounts
 
For t
he years ended
December 31, 2017,
2016
and
2015:
 
   
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
  
 
 
(
1
)
Deductions from the allowance for doubtful accounts equal accounts receivable written off, less recoveries, against the allowance. Deductions from the reserves for inventory excess and obsolete items equal inventory written off against the reserve as items were disposed of.