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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2016
Accounting Policies [Abstract] |
Dividends Declared [Table Text Block] |
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
First Quarter | $ | 0.13 |  |  | $ | 0.12 |  |  | $ | 0.10 |
Second Quarter | $ | 0.13 |  |  | $ | 0.12 |  |  | $ | 0.10 |
Third Quarter | $ | 0.13 |  |  | $ | 0.12 |  |  | $ | 0.12 |
Fourth Quarter | $ | 0.13 |  |  | $ | 0.12 |  |  | $ | 0.12 |
Available-for-sale Securities [Table Text Block] | Amortized cost and estimated fair market value of investments classified as available-for-sale (excluding cash equivalents) at December 31, 2016, were as follows:
| Amortized |  | Gross Unrealized |  | Estimated Fair
(in thousands) | Cost |  | Gains | Losses |  | Market Value
Investments due in less than 3 months: |  |  |  |  |  |
Commercial paper | $ | 36,996 |  |  | $ | — |  | $ | — |  |  | $ | 36,996 |
Corporate securities | 9,342 |  |  | 2 |  | (2 | ) |  | 9,342 |
Total | 46,338 |  |  | 2 |  | (2 | ) |  | 46,338 |
Investments due in 4-12 months: |  |  |  |  |  |
Commercial paper | 19,186 |  |  | — |  | — |  |  | 19,186 |
Corporate securities | 59,714 |  |  | 15 |  | (76 | ) |  | 59,653 |
Total | 78,900 |  |  | 15 |  | (76 | ) |  | 78,839 |
Investments due 12 months or greater: |  |  |  |  |  |
Corporate securities | 63,305 |  |  | 21 |  | (180 | ) |  | 63,146 |
Total | 63,305 |  |  | 21 |  | (180 | ) |  | 63,146 |
Total investment securities | $ | 188,543 |  |  | $ | 38 |  | $ | (258 | ) |  | $ | 188,323 |
Amortized cost and estimated fair market value of investments classified as available-for-sale (excluding cash equivalents) at December 31, 2015, were as follows:
| Amortized |  | Gross Unrealized |  | Estimated Fair
(in thousands) | Cost |  | Gains | Losses |  | Market Value
Investments due in less than 3 months: |  |  |  |  |  |
Corporate securities | $ | 38,586 |  |  | $ | 7 |  | $ | (10 | ) |  | $ | 38,583 |
Total | 38,586 |  |  | 7 |  | (10 | ) |  | 38,583 |
Investments due in 4-12 months: |  |  |  |  |  |
Corporate securities | 33,654 |  |  | 1 |  | (36 | ) |  | 33,619 |
Total | 33,654 |  |  | 1 |  | (36 | ) |  | 33,619 |
Investments due between 12 months or greater: |  |  |  |  |  |
Corporate securities | 11,626 |  |  | — |  | (59 | ) |  | 11,567 |
Total | 11,626 |  |  | — |  | (59 | ) |  | 11,567 |
Total investment securities | $ | 83,866 |  |  | $ | 8 |  | $ | (105 | ) |  | $ | 83,769 |
Schedule of Inventories [Table Text Block] | Inventories consist of the following:
(in thousands) | December 31, 2016 |  | December 31, 2015
Raw materials | $ | 14,610 |  |  | $ | 19,090 |
Work-in-process | 15,194 |  |  | 12,770 |
Finished goods | 22,760 |  |  | 20,074 |
Total | $ | 52,564 |  |  | $ | 51,934 |
Schedule of Accounts Receivable [Table Text Block] | Accounts receivable:
(in thousands) | December 31, 2016 |  | December 31, 2015
Accounts receivable trade | $ | 46,849 |  |  | $ | 43,622 |
Accrued ship and debit and rebate claims | (39,363 | ) |  | (35,486 | )
Allowance for doubtful accounts | (525 | ) |  | (318 | )
Total | $ | 6,961 |  |  | $ | 7,818 |
Schedule of Prepaid Expenses and Other Current Assets [Table Text Block] | Prepaid expenses and other current assets:
(in thousands) | December 31, 2016 |  | December 31, 2015
Prepaid legal fees | $ | 212 |  |  | $ | 2,023 |
Advance to suppliers | 69 |  |  | 324 |
Prepaid income tax | 2,431 |  |  | 309 |
Prepaid maintenance agreements | 1,399 |  |  | 736 |
Interest receivable | 743 |  |  | 519 |
Other | 3,666 |  |  | 2,879 |
Total | $ | 8,520 |  |  | $ | 6,790 |
Schedule of Property and Equipment [Table Text Block] | Property and equipment consist of the following:
(in thousands) | December 31, 2016 |  | December 31, 2015
Land | $ | 20,288 |  |  | $ | 20,288 |
Construction-in-progress | 6,880 |  |  | 2,298 |
Building and improvements | 52,156 |  |  | 51,941 |
Machinery and equipment | 132,162 |  |  | 128,342 |
Computer software and hardware and office furniture and fixtures | 45,951 |  |  | 43,383 |
| 257,437 |  |  | 246,252 |
Accumulated depreciation | (162,141 | ) |  | (146,871 | )
Total | $ | 95,296 |  |  | $ | 99,381 |
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 income (loss) for the three years ended December 31, 2016:
(in thousands) | Unrealized Gains and Losses on Available-for-Sale Securities |  | Defined Benefit Pension Items |  | Foreign Currency Items |  | Total
Balance at January 1, 2014 | $ | 210 |  |  | $ | (780 | ) |  | $ | 100 |  |  | $ | (470 | )
Other comprehensive income (loss) before reclassifications | (127 | ) |  | (538 | ) |  | (79 | ) |  | (744 | )
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | 78 |  | (1) | — |  |  | 78 |
Other comprehensive income loss | (127 | ) |  | (460 | ) |  | (79 | ) |  | (666 | )
Balance at December 31, 2014 | 83 |  |  | (1,240 | ) |  | 21 |  |  | (1,136 | )
Other comprehensive income (loss) before reclassifications | (180 | ) |  | (469 | ) |  | (191 | ) |  | (840 | )
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | 125 |  | (1) | — |  |  | 125 |
Other comprehensive loss | (180 | ) |  | (344 | ) |  | (191 | ) |  | (715 | )
Balance at December 31, 2015 | (97 | ) |  | (1,584 | ) |  | (170 | ) |  | (1,851 | )
Other comprehensive income (loss) before reclassifications | (123 | ) |  | (505 | ) |  | (384 | ) |  | (1,012 | )
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | 153 |  | (1) | — |  |  | 153 |
Other comprehensive loss | (123 | ) |  | (352 | ) |  | (384 | ) |  | (859 | )
Balance at December 31, 2016 | $ | (220 | ) |  | $ | (1,936 | ) |  | $ | (554 | ) |  | $ | (2,710 | )
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