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Business and geographic segments - Schedule of Business segment information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Net sales: |  |  |
Total net sales | $ 145,941 | $ 161,287 | $ 166,562
Total Cost of sales | 104,578 | 112,068 | 117,763
Total Gross margin | 41,363 | 49,219 | 48,799
Total Segment selling, general and administrative expense | 24,340 | 23,784 | 23,363
Operating income (loss): |  |  |
Total operating income | 17,023 | 25,435 | 25,436
Interest income | 4,714 | 4,168 | 1,877
Income before income taxes | 21,737 | 29,603 | 27,313
Depreciation and amortization | 3,691 | 3,973 | 3,977
Capital expenditures: | 1,432 | 1,130 | 3,695
Security Products |  |  |
Net sales: |  |  |
Total net sales | 115,243 | 121,182 | 114,519
Total Cost of sales | 80,509 | 82,781 | 79,068
Total Gross margin | 34,734 | 38,401 | 35,451
Operating income (loss): |  |  |
Capital expenditures: | 603 | 970 | 2,015
Marine Components |  |  |
Net sales: |  |  |
Total net sales | 30,698 | 40,105 | 52,043
Total Cost of sales | 24,069 | 29,287 | 38,695
Total Gross margin | 6,629 | 10,818 | 13,348
Operating income (loss): |  |  |
Capital expenditures: | 829 | 160 | 1,680
Operating Segments |  |  |
Net sales: |  |  |
Total Segment selling, general and administrative expense | 17,221 | 17,060 | 16,494
Operating income (loss): |  |  |
Total operating income | 24,142 | 32,159 | 32,305
Operating Segments | Security Products |  |  |
Net sales: |  |  |
Total Segment selling, general and administrative expense | 13,894 | 13,460 | 12,707
Operating income (loss): |  |  |
Total operating income | 20,840 | 24,941 | 22,744
Depreciation and amortization | 2,489 | 2,748 | 2,801
Operating Segments | Marine Components |  |  |
Net sales: |  |  |
Total Segment selling, general and administrative expense | 3,327 | 3,600 | 3,787
Operating income (loss): |  |  |
Total operating income | 3,302 | 7,218 | 9,561
Depreciation and amortization | 1,202 | 1,217 | 1,167
Corporate |  |  |
Operating income (loss): |  |  |
Total operating income | $ (7,119) | (6,724) | (6,869)
Depreciation and amortization |  | $ 8 | $ 9

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