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Business Segment Information - Schedule of Business Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Net sales:    
Total net sales $ 42,050 $ 35,924
Operating income (loss):    
Total operating income 6,306 5,817
Interest income 214 338
Income before income taxes 6,520 6,155
Operating Segments | Security Products    
Net sales:    
Total net sales 29,581 25,885
Operating income (loss):    
Total operating income 6,010 5,490
Operating Segments | Marine Components    
Net sales:    
Total net sales 12,469 10,039
Operating income (loss):    
Total operating income 2,009 1,943
Corporate    
Operating income (loss):    
Total operating income $ (1,713) $ (1,616)