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Business and Geographic Segments - Schedule of Business Segment Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Total net sales | $ 140,815 | $ 114,537 | $ 124,243
Total operating income (loss) | 20,526 | 11,817 | 17,666
Interest income | 1,197 | 1,680 | 3,270
Income before income taxes | 21,723 | 13,497 | 20,936
Depreciation and amortization | 3,839 | 3,827 | 3,684
Total capital expenditures | 4,094 | 1,740 | 3,166
Operating Segments | Security Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net sales | 105,124 | 87,863 | 99,328
Total operating income (loss) | 21,622 | 14,926 | 21,013
Depreciation and amortization | 2,890 | 3,069 | 3,056
Total capital expenditures | 1,044 | 1,252 | 1,530
Operating Segments | Marine Components |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net sales | 35,691 | 26,674 | 24,915
Total operating income (loss) | 5,591 | 4,088 | 3,644
Depreciation and amortization | 940 | 757 | 627
Total capital expenditures | 3,050 | 458 | 1,636
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Total operating income (loss) | (6,687) | (7,197) | (6,991)
Depreciation and amortization | $ 9 | 1 | $ 1
Total capital expenditures |  | $ 30 |

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