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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Schedule II
– Valuation an
d
Qualifying Accounts
 
   
Beginning
Balance
    
Charged to cost
and expenses
    
Deductions
(1) (2)
    
Ending
Balance
  
Deferred Tax Asset Valuation Allowance
                                
2016
  
$
-
   
$
576
   
$ 
 -
 
  
$
576
 
2015
    
15,572
      
368
      
(15,940
 )    
-
  
2014
    
20,987
      
-
      
(5,415
 )    
15,572
  
                                 
                                 
Receivables Allowance for Doubtful Accounts
                                
2016
  
$
3,044
   
$
1,972
   
$
(1,431
)
  
$
3,585
  
2015
    
3,248
      
19
      
(223
 )    
3,044
  
2014
    
1,889
      
1,432
      
(73
 )    
3,248
  
 
(1)
Deductions from deferred tax asset valuation allowance represent re
versals of previously established allowances
(2)
Deductions from the receivables allowance for doubtful accounts represent uncollectible accounts written off and recoveries