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Business segment information - Schedule of Business Segment Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Net sales: |  |  |
Total net sales | $ 161,287 | $ 166,562 | $ 140,815
Operating income (loss): |  |  |
Total operating income | 25,435 | 25,436 | 20,526
Interest income | 4,168 | 1,877 | 1,197
Income before income taxes | 29,603 | 27,313 | 21,723
Depreciation and amortization | 3,973 | 3,977 | 3,839
Total capital expenditures | 1,130 | 3,695 | 4,094
Security Products |  |  |
Net sales: |  |  |
Total net sales | 121,182 | 114,519 | 105,124
Operating income (loss): |  |  |
Capital expenditures: | 970 | 2,015 | 1,044
Marine Components |  |  |
Net sales: |  |  |
Total net sales | 40,105 | 52,043 | 35,691
Operating income (loss): |  |  |
Capital expenditures: | 160 | 1,680 | 3,050
Operating Segments | Security Products |  |  |
Operating income (loss): |  |  |
Total operating income | 24,941 | 22,744 | 21,622
Depreciation and amortization | 2,748 | 2,801 | 2,890
Operating Segments | Marine Components |  |  |
Operating income (loss): |  |  |
Total operating income | 7,218 | 9,561 | 5,591
Depreciation and amortization | 1,217 | 1,167 | 940
Corporate |  |  |
Operating income (loss): |  |  |
Total operating income | (6,724) | (6,869) | (6,687)
Depreciation and amortization | $ 8 | $ 9 | $ 9

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