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Business segment information (Tables) | 12 Months Ended
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Dec. 31, 2023
Segment Reporting [Abstract] |
Schedule of Business Segment Information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ | ​ | 2021 |  | 2022 |  | 2023
​ | ​ | (In thousands)
Net sales: | ​ | ​ |  |  | ​ |  |  | ​ |
Security Products | ​ | $ | 105,124 | ​ | $ | 114,519 | ​ | $ | 121,182
Marine Components | ​ |  | 35,691 | ​ |  | 52,043 | ​ |  | 40,105
Total net sales | ​ | $ | 140,815 | ​ | $ | 166,562 | ​ | $ | 161,287
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating income: | ​ |  |  | ​ |  |  | ​ |  |
Security Products | ​ | $ | 21,622 | ​ | $ | 22,744 | ​ | $ | 24,941
Marine Components | ​ |  | 5,591 | ​ |  | 9,561 | ​ |  | 7,218
Corporate operating expenses | ​ |  | (6,687) | ​ |  | (6,869) | ​ |  | (6,724)
Total operating income | ​ |  | 20,526 | ​ |  | 25,436 | ​ |  | 25,435
Interest income | ​ |  | 1,197 | ​ |  | 1,877 | ​ |  | 4,168
Income before income taxes | ​ | $ | 21,723 | ​ | $ | 27,313 | ​ | $ | 29,603
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Depreciation and amortization: | ​ |  |  | ​ |  |  | ​ |  |
Security Products | ​ | $ | 2,890 | ​ | $ | 2,801 | ​ | $ | 2,748
Marine Components | ​ |  | 940 | ​ |  | 1,167 | ​ |  | 1,217
Corporate | ​ |  | 9 | ​ |  | 9 | ​ |  | 8
Total | ​ | $ | 3,839 | ​ | $ | 3,977 | ​ | $ | 3,973
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Capital expenditures: |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Security Products | ​ | $ | 1,044 | ​ | $ | 2,015 | ​ | $ | 970
Marine Components | ​ |  | 3,050 | ​ |  | 1,680 | ​ |  | 160
Total | ​ | $ | 4,094 | ​ | $ | 3,695 | ​ | $ | 1,130
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net sales point of destination: |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
United States | ​ | $ | 129,160 | ​ | $ | 153,982 | ​ | $ | 155,092
Canada | ​ |  | 8,061 | ​ |  | 9,227 | ​ |  | 3,153
Mexico | ​ |  | 589 | ​ |  | 722 | ​ |  | 829
Other | ​ |  | 3,005 | ​ |  | 2,631 | ​ |  | 2,213
Total | ​ | $ | 140,815 | ​ | $ | 166,562 | ​ | $ | 161,287
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2021 |  | 2022 |  | 2023
​ | ​ | (In thousands)
Total assets: |  | ​ |  |  | ​ |  |  | ​ |
Security Products | ​ | $ | 78,193 | ​ | $ | 80,671 | ​ | $ | 78,519
Marine Components | ​ |  | 18,167 | ​ |  | 26,372 | ​ |  | 24,619
Corporate | ​ |  | 96,092 | ​ |  | 70,344 | ​ |  | 84,466
Total | ​ | $ | 192,452 | ​ | $ | 177,387 | ​ | $ | 187,604
​

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482573/350-20-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-25 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-30 + Details
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