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COMPONENTS OF THE COMPANY'S CONSOLIDATED BALANCE SHEETS (Tables) | 12 Months Ended
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Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract] |
Schedule of Accounts Receivable [Table Text Block] | Accounts Receivable
(in thousands) | December 31, 2019 |  | December 31, 2018
Accounts receivable trade | $ | 61,036 |  |  | $ | 54,055 |
Accrued ship and debit | (33,475 | ) |  | (40,118 | )
Allowance for stock rotation and rebate | (2,524 | ) |  | (2,159 | )
Allowance for doubtful accounts | (763 | ) |  | (706 | )
Total | $ | 24,274 |  |  | $ | 11,072 |
Schedule of Inventory, Current [Table Text Block] | Inventories
(in thousands) | December 31, 2019 |  | December 31, 2018
Raw materials | $ | 39,058 |  |  | $ | 41,138 |
Work-in-process | 25,982 |  |  | 15,612 |
Finished goods | 25,340 |  |  | 24,107 |
Total | $ | 90,380 |  |  | $ | 80,857 |
Schedule of Prepaid Expenses and Other Current Assets [Table Text Block] | Prepaid Expenses and Other Current Assets
(in thousands) | December 31, 2019 |  | December 31, 2018
Prepaid income tax | $ | 5,615 |  |  | $ | 3,081 |
Prepaid legal fees | 16 |  |  | 181 |
Prepaid maintenance agreements | 819 |  |  | 2,047 |
Advance to suppliers | 3,579 |  |  | 2,157 |
Interest receivable | 1,279 |  |  | 595 |
Other | 4,289 |  |  | 3,854 |
Total | $ | 15,597 |  |  | $ | 11,915 |
Property and Equipment [Table Text Block] | Property and Equipment
(in thousands) | December 31, 2019 |  | December 31, 2018
Land | $ | 21,790 |  |  | $ | 20,288 |
Construction-in-progress | 18,604 |  |  | 21,696 |
Building and improvements | 55,785 |  |  | 53,610 |
Machinery and equipment | 168,576 |  |  | 160,028 |
Computer software and hardware and office furniture and fixtures | 52,265 |  |  | 53,681 |
| 317,020 |  |  | 309,303 |
Accumulated depreciation | (200,401 | ) |  | (195,186 | )
Total | $ | 116,619 |  |  | $ | 114,117 |
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] | Changes in accumulated other comprehensive loss for the three years ended December 31, 2019:
(in thousands) | Unrealized Gains and Losses on Available-for-Sale Securities |  | Defined Benefit Pension Items |  | Foreign Currency Items |  | Total
Balance at January 1, 2017 | $ | (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 income | (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 | )
Other comprehensive income (loss) before reclassifications | 849 |  |  | (1,839 | ) |  | (518 | ) |  | (1,508 | )
Amounts reclassified from accumulated other comprehensive loss | — |  |  | 67 |  | (1) | — |  |  | 67 |
Other comprehensive loss | 849 |  |  | (1,772 | ) |  | (518 | ) |  | (1,441 | )
Balance at December 31, 2019 | $ | 583 |  |  | $ | (2,484 | ) |  | $ | (1,229 | ) |  | $ | (3,130 | )
_______________ (1) This component of accumulated other comprehensive loss is included in the computation of net periodic pension cost for the years ended December 31, 2019, 2018 and 2017.

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