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COMPONENTS OF THE COMPANY'S CONSOLIDATED BALANCE SHEETS (Tables)
 12 Months Ended
Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]  
Schedule of Accounts Receivable [Table Text Block]
Accounts Receivable
(in thousands)
December 31, 2018
 
December 31, 2017
Accounts receivable trade
$
54,055

 
$
58,718

Accrued ship and debit
(40,118
)
 
(39,486
)
Allowance for stock rotation and rebate
(2,159
)
 
(1,700
)
Allowance for doubtful accounts
(706
)
 
(734
)
Total
$
11,072

 
$
16,798
Schedule of Inventory, Current [Table Text Block]
Inventories
(in thousands)
December 31, 2018
 
December 31, 2017
Raw materials
$
41,138

 
$
15,517

Work-in-process
15,612

 
16,765

Finished goods
24,107

 
24,805

Total
$
80,857

 
$
57,087
Schedule of Prepaid Expenses and Other Current Assets [Table Text Block]
Prepaid Expenses and Other Current Assets
(in thousands)
December 31, 2018
 
December 31, 2017
Prepaid income tax
$
3,081

 
$
460

Prepaid legal fees
181

 
213

Prepaid maintenance agreements
2,047

 
856

Advance to suppliers
2,157

 
1,211

Interest receivable
595

 
1,195

Other
3,854

 
3,823

Total
$
11,915

 
$
7,758
Property and Equipment [Table Text Block]
Property and Equipment
(in thousands)
December 31, 2018
 
December 31, 2017
Land
$
20,288

 
$
20,288

Construction-in-progress
21,696

 
15,353

Building and improvements
53,610

 
52,655

Machinery and equipment
160,028

 
151,269

Computer software and hardware and office furniture and fixtures
53,681

 
50,440

 
309,303

 
290,005

Accumulated depreciation
(195,186
)
 
(178,300
)
Total
$
114,117

 
$
111,705
Property and Equipment Useful Lives [Table Text Block]
Building and improvements
4-40 years
Machinery and equipment
2-8 years
Computer software and hardware and office furniture and fixtures
4-7 years
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Accumulated Other Comprehensive Loss
Changes in accumulated other comprehensive loss for the three years ended December 31, 2018:
(in thousands)
Unrealized Gains and Losses on Available-for-Sale Securities
 
Defined Benefit Pension Items
 
Foreign Currency Items
 
Total
Balance at January 1, 2016
$
(97
)
 
$
(1,584
)
 
$
(170
)
 
$
(1,851
)
Other comprehensive loss before reclassifications
(123
)
 
(505
)
 
(384
)
 
(1,012
)
Amounts reclassified from accumulated other comprehensive loss
—

 
153

(1) 
—

 
153

Other comprehensive loss
(123
)
 
(352
)
 
(384
)
 
(859
)
Balance at December 31, 2016
(220
)
 
(1,936
)
 
(554
)
 
(2,710
)
Other comprehensive income (loss) before reclassifications
(207
)
 
502

 
79

 
374

Amounts reclassified from accumulated other comprehensive loss
—

 
197

(1) 
—

 
197

Other comprehensive loss
(207
)
 
699

 
79

 
571

Balance at December 31, 2017
(427
)
 
(1,237
)
 
(475
)
 
(2,139
)
Other comprehensive income (loss) before reclassifications
161

 
401

 
(236
)
 
326

Amounts reclassified from accumulated other comprehensive loss
—

 
124

(1) 
—

 
124

Other comprehensive income
161

 
525

 
(236
)
 
450

Balance at December 31, 2018
$
(266
)
 
$
(712
)
 
$
(711
)
 
$
(1,689
)
_______________
(1)
This component of accumulated other comprehensive loss is included in the computation of net periodic pension cost for the years ended December 31, 2018, 2017 and 2016.