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COMPONENTS OF THE COMPANY'S CONSOLIDATED BALANCE SHEETS | 12 Months Ended
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Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract] |
COMPONENTS OF THE COMPANY'S CONSOLIDATED BALANCE SHEETS [Text Block] | 3. COMPONENTS OF THE COMPANY’S CONSOLIDATED BALANCE SHEETS: Accounts Receivable
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31,
(In thousands) | ​ | 2020 | ​ | 2019
Accounts receivable trade | ​ | $ | 66,703 | ​ | $ | 61,036
Accrued ship and debit | ​ |  | (26,435) | ​ |  | (33,475)
Allowance for stock rotation and rebate | ​ |  | (3,931) | ​ |  | (2,524)
Allowance for credit losses | ​ | ​ | (427) | ​ | ​ | (763)
Total | ​ | $ | 35,910 | ​ | $ | 24,274
​ The Company maintains an allowance for estimated credit losses resulting from the inability of customers to make required payments. This allowance is established using estimates formulated by the Company’s management based upon factors such as the composition of the accounts receivable aging, historical losses, changes in payments patterns, customer creditworthiness, and current economic trends. Receivables determined to be uncollectible are written off and deducted from the allowance. ​
​ | ​ | ​ | ​
​ | ​ | Allowance for Credit Losses
​ | ​ | Year Ended
(In thousands) |  | December 31, 2020
Beginning balance | ​ | $ | (763)
Provision for credit loss expense | ​ |  | (621)
Receivables written off | ​ |  | 198
Recoveries collected | ​ |  | 759
Ending balance | ​ | $ | (427)
​ Inventories
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31,
(In thousands) | ​ | 2020 | ​ | 2019
Raw materials | ​ | $ | 32,131 | ​ | $ | 39,058
Work-in-process | ​ |  | 39,469 | ​ |  | 25,982
Finished goods | ​ |  | 31,278 | ​ |  | 25,340
Total | ​ | $ | 102,878 | ​ | $ | 90,380
​ Property and Equipment
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31,
(In thousands) | ​ | 2020 | ​ | 2019
Land | ​ | $ | 22,189 | ​ | $ | 21,790
Construction-in-progress | ​ |  | 34,886 | ​ |  | 18,604
Building and improvements | ​ |  | 64,808 | ​ |  | 55,785
Machinery and equipment | ​ |  | 202,698 | ​ |  | 168,576
Computer software and hardware and office furniture and fixtures | ​ |  | 55,591 | ​ |  | 52,265
​ | ​ |  | 380,172 | ​ |  | 317,020
Accumulated depreciation | ​ |  | (213,984) | ​ |  | (200,401)
Total | ​ | $ | 166,188 | ​ | $ | 116,619
​ Depreciation expense for property and equipment for fiscal years ended December 31, 2020, 2019 and 2018, was approximately $23.7 million, $19.2 million and $18.9 million, respectively, and was determined using the straight-line method over the following useful lives: ​
​ | ​ | ​ | ​
Building and improvements |  | 4 - 40 | years
Machinery and equipment |  | 2 - 8 | years
Computer software and hardware and office furniture and fixtures |  | 4 - 7 | years
​ Total property and equipment (excluding accumulated depreciation) located in the United States at December 31, 2020, 2019 and 2018, was approximately $167.0 million, $160.7 million and $167.6 million, respectively. In 2020, 2019 and 2018 approximately 14%, 14% and 12%, respectively, of total property and equipment (excluding accumulated depreciation) was held in Thailand by one of the Company’s subcontractors. Also in 2020, approximately 14% of total property and equipment was held by one of the Company’s subcontractors in Malaysia. No other country held 10% or more of total property and equipment in the periods presented. Accumulated Other Comprehensive Loss Changes in accumulated other comprehensive loss for the three years ended December 31, 2020:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Unrealized Gains |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
​ | ​ | and Losses on | ​ | ​ | ​ | ​ | Foreign | ​ | ​ | ​
​ | ​ | Available-for-Sale | ​ | Defined Benefit | ​ | Currency | ​ | ​ | ​
(In thousands) | ​ | Securities | ​ | Pension Items | ​ | Items | ​ | Total
Balance at January 1, 2018 | ​ | $ | (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)
Other comprehensive income (loss) before reclassifications | ​ |  | 307 | ​ |  | 636 | ​ |  | (183) | ​ |  | 760
Amounts reclassified from accumulated other comprehensive loss | ​ |  | — | ​ |  | 207 | (1) |  | — | ​ |  | 207
Other comprehensive income | ​ |  | 307 | ​ |  | 843 | ​ |  | (183) | ​ |  | 967
Balance at December 31, 2020 | ​ | $ | 890 | ​ | $ | (1,641) | ​ | $ | (1,412) | ​ | $ | (2,163)
(1) | This component of accumulated other comprehensive loss is included in the computation of net periodic pension cost for the years ended December 31, 2020, 2019 and 2018.

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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