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Business and Geographic Segments - Business Segment Information by Geographical Areas (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Net sales $ 140,815 $ 114,537 $ 124,243
Total assets 192,452 184,045 178,544
Operating Segments | Security Products      
Segment Reporting Information [Line Items]      
Net sales 105,124 87,863 99,328
Total assets 78,193 70,755 73,697
Operating Segments | Marine Components      
Segment Reporting Information [Line Items]      
Net sales 35,691 26,674 24,915
Total assets 18,167 15,515 15,256
Corporate and eliminations      
Segment Reporting Information [Line Items]      
Total assets 96,092 97,775 89,591
Point Of Destination | United States      
Segment Reporting Information [Line Items]      
Net sales 129,160 107,712 114,186
Point Of Destination | Canada      
Segment Reporting Information [Line Items]      
Net sales 8,061 4,423 7,257
Point Of Destination | Mexico      
Segment Reporting Information [Line Items]      
Net sales 589 431 922
Point Of Destination | Other      
Segment Reporting Information [Line Items]      
Net sales $ 3,005 $ 1,971 $ 1,878