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Business Segment Information - Schedule of Business Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Net sales:        
Total net sales $ 33,730 $ 32,385 $ 64,907 $ 60,798
Operating income (loss):        
Total operating income 5,622 5,984 9,913 10,357
Interest income 828 640 1,664 1,212
Income before taxes 6,450 6,624 11,577 11,569
Operating Segments | Security Products        
Net sales:        
Total net sales 26,927 27,248 51,631 51,304
Operating income (loss):        
Total operating income 6,048 6,814 11,124 12,426
Operating Segments | Marine Components        
Net sales:        
Total net sales 6,803 5,137 13,276 9,494
Operating income (loss):        
Total operating income 1,280 937 2,181 1,523
Corporate        
Operating income (loss):        
Total operating income $ (1,706) $ (1,767) $ (3,392) $ (3,592)