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Business and Geographic Segments - Schedule of Business Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales | $ 29,600 | $ 29,700 | $ 33,700 | $ 31,200 | $ 27,400 | $ 30,000 | $ 32,400 | $ 28,400 | $ 124,243 | $ 118,217 | $ 112,035
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |
Total operating income | $ 3,500 | $ 4,300 | $ 5,600 | $ 4,300 | $ 2,900 | $ 4,500 | $ 6,000 | $ 4,400 | 17,666 | 17,811 | 15,235
Interest income |  |  |  |  |  |  |  |  | 3,270 | 2,664 | 1,929
Income before income taxes |  |  |  |  |  |  |  |  | 20,936 | 20,475 | 17,164
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,684 | 3,454 | 3,673
Total capital expenditure |  |  |  |  |  |  |  |  | 3,166 | 3,117 | 2,796
Operating Segments | Security Products |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 99,328 | 98,383 | 96,600
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |
Total operating income |  |  |  |  |  |  |  |  | 21,013 | 21,947 | 19,182
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,056 | 2,914 | 3,072
Total capital expenditure |  |  |  |  |  |  |  |  | 1,530 | 2,126 | 2,389
Operating Segments | Marine Components |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 24,915 | 19,834 | 15,435
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |
Total operating income |  |  |  |  |  |  |  |  | 3,644 | 2,738 | 1,342
Depreciation and amortization |  |  |  |  |  |  |  |  | 627 | 535 | 591
Total capital expenditure |  |  |  |  |  |  |  |  | 1,636 | 991 | 405
Corporate |  |  |  |  |  |  |  |  |  |  |
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |
Total operating income |  |  |  |  |  |  |  |  | (6,991) | (6,874) | (5,289)
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 1 | $ 5 | 10
Total capital expenditure |  |  |  |  |  |  |  |  |  |  | $ 2

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