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Business and Geographic Segments (Tables) | 12 Months Ended
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Dec. 31, 2022
Segment Reporting [Abstract] |
Schedule of Business Segment Information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ | ​ | 2020 |  | 2021 |  | 2022
​ | ​ | (In thousands)
Net sales: | ​ | ​ |  |  | ​ |  |  | ​ |
Security Products | ​ | $ | 87,863 | ​ | $ | 105,124 | ​ | $ | 114,519
Marine Components | ​ |  | 26,674 | ​ |  | 35,691 | ​ |  | 52,043
Total net sales | ​ | $ | 114,537 | ​ | $ | 140,815 | ​ | $ | 166,562
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating income: | ​ |  |  | ​ |  |  | ​ |  |
Security Products | ​ | $ | 14,926 | ​ | $ | 21,622 | ​ | $ | 22,744
Marine Components | ​ |  | 4,088 | ​ |  | 5,591 | ​ |  | 9,561
Corporate operating expenses | ​ |  | (7,197) | ​ |  | (6,687) | ​ |  | (6,869)
Total operating income | ​ |  | 11,817 | ​ |  | 20,526 | ​ |  | 25,436
Interest income | ​ |  | 1,680 | ​ |  | 1,197 | ​ |  | 1,877
Income before income taxes | ​ | $ | 13,497 | ​ | $ | 21,723 | ​ | $ | 27,313
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Depreciation and amortization: | ​ |  |  | ​ |  |  | ​ |  |
Security Products | ​ | $ | 3,069 | ​ | $ | 2,890 | ​ | $ | 2,801
Marine Components | ​ |  | 757 | ​ |  | 940 | ​ |  | 1,167
Corporate | ​ |  | 1 | ​ |  | 9 | ​ |  | 9
Total | ​ | $ | 3,827 | ​ | $ | 3,839 | ​ | $ | 3,977
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Capital expenditures: |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Security Products | ​ | $ | 1,252 | ​ | $ | 1,044 | ​ | $ | 2,015
Marine Components | ​ |  | 458 | ​ |  | 3,050 | ​ |  | 1,680
Corporate | ​ |  | 30 | ​ |  | — | ​ |  | —
Total | ​ | $ | 1,740 | ​ | $ | 4,094 | ​ | $ | 3,695
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net sales point of destination: |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
United States | ​ | $ | 107,712 | ​ | $ | 129,160 | ​ | $ | 153,982
Canada | ​ |  | 4,423 | ​ |  | 8,061 | ​ |  | 9,227
Mexico | ​ |  | 431 | ​ |  | 589 | ​ |  | 722
Other | ​ |  | 1,971 | ​ |  | 3,005 | ​ |  | 2,631
Total | ​ | $ | 114,537 | ​ | $ | 140,815 | ​ | $ | 166,562
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2021 |  | 2022
​ | ​ | (In thousands)
Total assets: |  | ​ |  |  | ​ |  |  | ​ |
Security Products | ​ | $ | 70,755 | ​ | $ | 78,193 | ​ | $ | 80,671
Marine Components | ​ |  | 15,515 | ​ |  | 18,167 | ​ |  | 26,372
Corporate | ​ |  | 97,775 | ​ |  | 96,092 | ​ |  | 70,344
Total | ​ | $ | 184,045 | ​ | $ | 192,452 | ​ | $ | 177,387
​

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