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COMPONENTS OF THE COMPANY'S CONSOLIDATED BALANCE SHEETS (Tables)
 12 Months Ended
Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]  
Schedule of Accounts Receivable [Table Text Block]
Accounts Receivable
(in thousands)
December 31, 2017
 
December 31, 2016
Accounts receivable trade
$
58,718

 
$
46,849

Accrued ship and debit
(39,486
)
 
(38,075
)
Allowance for stock rotation and rebate
(1,700
)
 
(1,721
)
Allowance for doubtful accounts
(734
)
 
(525
)
Total
$
16,798

 
$
6,528
Schedule of Inventory, Current [Table Text Block]
Inventories
(in thousands)
December 31, 2017
 
December 31, 2016
Raw materials
$
15,517

 
$
14,610

Work-in-process
16,765

 
15,194

Finished goods
24,805

 
22,760

Total
$
57,087

 
$
52,564
Schedule of Prepaid Expenses and Other Current Assets [Table Text Block]
Prepaid Expenses and Other Current Assets
(in thousands)
December 31, 2017
 
December 31, 2016
Prepaid income tax
$
460

 
$
2,431

Prepaid legal fees
213

 
212

Prepaid maintenance agreements
856

 
1,399

Advance to suppliers
1,211

 
69

Interest receivable
1,195

 
743

Other
3,823

 
3,861

Total
$
7,758

 
$
8,715
Property and Equipment [Table Text Block]
Property and Equipment
(in thousands)
December 31, 2017
 
December 31, 2016
Land
$
20,288

 
$
20,288

Construction-in-progress
15,353

 
6,880

Building and improvements
52,655

 
52,156

Machinery and equipment
151,269

 
132,162

Computer software and hardware and office furniture and fixtures
50,440

 
45,951

 
290,005

 
257,437

Accumulated depreciation
(178,300
)
 
(162,141
)
Total
$
111,705

 
$
95,296
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, 2017:
(in thousands)
Unrealized Gains and Losses on Available-for-Sale Securities
 
Defined Benefit Pension Items
 
Foreign Currency Items
 
Total
Balance at January 1, 2015
$
83

 
$
(1,240
)
 
$
21

 
$
(1,136
)
Other comprehensive loss before reclassifications
(180
)
 
(469
)
 
(191
)
 
(840
)
Amounts reclassified from accumulated other comprehensive loss
—

 
125

(1) 
—

 
125

Other comprehensive loss
(180
)
 
(344
)
 
(191
)
 
(715
)
Balance at December 31, 2015
(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 before reclassifications
(207
)
 
502

 
79

 
374

Amounts reclassified from accumulated other comprehensive loss
—

 
197

(1) 
—

 
197

Other comprehensive income
(207
)
 
699

 
79

 
571

Balance at December 31, 2017
$
(427
)
 
$
(1,237
)
 
$
(475
)
 
$
(2,139
)
_______________
(1)
This component of accumulated other comprehensive loss is included in the computation of net periodic pension cost for the years ended December 31, 2017, 2016 and 2015.