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VALUATION AND QUALIFYING ACCOUNTS (Tables)
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation and Qualifying Accounts Disclosure [Table Text Block]
 
 
 
 
Deducted from Assets
  
 
Doubtful Accounts
 
Returns and Allowances
 
Total
  
 
(Dollars in thousands)
BALANCE, DECEMBER 31, 2014
 
$
1,227
 
 
$
1,157
 
 
$
2,384
 
Add – Additions charged to earnings
 
 
235
 
 
 
3,200
 
 
 
3,435
 
Deduct – Charges for purposes for which reserves were established
 
 
(286
) 
 
 
(3,276
) 
 
 
(3,562
) 
BALANCE, DECEMBER 31, 2015
 
$
1,176
 
 
$
1,081
 
 
$
2,257
 
Add – Additions charged to earnings
 
 
76
 
 
 
3,290
 
 
 
3,366
 
Deduct – Charges for purposes for which reserves were established
 
 
(90
) 
 
 
(2,829
) 
 
 
(2,919
) 
Deduct – Adjustment to reserve
 
 
(188
) 
 
 
—
 
 
 
(188
) 
BALANCE, DECEMBER 31, 2016
 
$
974
 
 
$
1,542
 
 
$
2,516
 
Add – Additions charged to earnings
 
 
621
 
 
 
3,865
 
 
 
4,486
 
Deduct – Charges for purposes for which reserves were established
 
 
(624
) 
 
 
(4,072
) 
 
 
(4,696
) 
Deduct – Adjustment to reserve
 
 
(100
) 
 
 
—
 
 
 
(100
) 
BALANCE, DECEMBER 31, 2017
 
$
871
 
 
$
1,335
 
 
$
2,206