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Note 18 - Valuation and Qualifying Accounts
12 Months Ended
Dec. 31, 2016
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,
2016,
2015
and
2014:
 
   
Balance at
Beginning of
Year
   
Additions
Charged to
Earnings
   
Charges to
Reserve, Net (1)
   
Reserves
Established for
Acquisitions
   
Balance at End
of Year
 
Year ended December 31, 201
6
                                       
Allowance for doubtful accounts
  $
2,494
    $
1,654
    $
(1,110
)   $
2,604
    $
5,642
 
Reserves for inventory
   
10,582
     
5,359
     
(5,357
)    
2,447
     
13,031
 
Valuation of deferred tax assets
   
1,523
     
638
     
     
2,201
     
4,362
 
                                         
Year ended December 31, 201
5
                                       
Allowance for doubtful accounts
  $
2,275
    $
481
    $
(325
)   $
63
    $
2,494
 
Reserves for inventory
   
9,387
     
3,739
     
(3,158
)    
614
     
10,582
 
Valuation of deferred tax assets
   
1,385
     
138
     
     
     
1,523
 
                                         
Year ended December 31, 201
4
                                       
Allowance for doubtful accounts
  $
2,658
    $
672
    $
(1,264
)   $
209
    $
2,275
 
Reserves for inventory
   
6,558
     
2,797
     
(2,250
)    
2,282
     
9,387
 
Valuation of deferred tax assets
   
1,021
     
364
     
     
     
1,385
 
 
 
(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.