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Business Segment Information - Schedule of Business Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net sales:        
Total net sales $ 36,253 $ 23,800 $ 72,177 $ 56,111
Operating income (loss):        
Total operating income 5,758 2,369 11,575 7,389
Interest income 318 370 656 977
Income before income taxes 6,076 2,739 12,231 8,366
Operating Segments | Security Products        
Net sales:        
Total net sales 27,587 18,573 53,472 44,042
Operating income (loss):        
Total operating income 5,845 3,361 11,335 9,074
Operating Segments | Marine Components        
Net sales:        
Total net sales 8,666 5,227 18,705 12,069
Operating income (loss):        
Total operating income 1,598 799 3,541 1,881
Corporate        
Operating income (loss):        
Total operating income $ (1,685) $ (1,791) $ (3,301) $ (3,566)