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Business Segment Information - Schedule of Business Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Net sales:        
Total net sales $ 32,385 $ 30,002 $ 60,798 $ 59,950
Operating income (loss):        
Total operating income 5,984 4,601 10,357 9,126
Interest income 640 482 1,212 817
Income before taxes 6,624 5,083 11,569 9,943
Operating Segments | Security Products        
Net sales:        
Total net sales 27,248 26,039 51,304 52,049
Operating income (loss):        
Total operating income 6,814 5,361 12,426 11,053
Operating Segments | Marine Components        
Net sales:        
Total net sales 5,137 3,963 9,494 7,901
Operating income (loss):        
Total operating income 937 495 1,523 866
Corporate        
Operating income (loss):        
Total operating income $ (1,767) $ (1,255) $ (3,592) $ (2,793)