Business and Geographic Segments - Business Segment Information by Geographical Areas (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net sales	$ 161,287	$ 166,562	$ 140,815
Total assets	187,604	177,387	192,452
Security Products [Member]
Segment Reporting Information [Line Items]
Net sales	121,182	114,519	105,124
Marine Components
Segment Reporting Information [Line Items]
Net sales	40,105	52,043	35,691
Operating Segments [Member] | Security Products [Member]
Segment Reporting Information [Line Items]
Total assets	78,519	80,671	78,193
Operating Segments [Member] | Marine Components
Segment Reporting Information [Line Items]
Total assets	24,619	26,372	18,167
Corporate
Segment Reporting Information [Line Items]
Total assets	84,466	70,344	96,092
Point Of Destination | United States
Segment Reporting Information [Line Items]
Net sales	155,092	153,982	129,160
Point Of Destination | Canada
Segment Reporting Information [Line Items]
Net sales	3,153	9,227	8,061
Point Of Destination | Mexico
Segment Reporting Information [Line Items]
Net sales	829	722	589
Point Of Destination | Other
Segment Reporting Information [Line Items]
Net sales	$ 2,213	$ 2,631	$ 3,005