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Business Segment Information - Schedule of Business Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Net sales:        
Total net sales $ 23,800 $ 33,730 $ 56,111 $ 64,907
Operating income (loss):        
Total operating income 2,369 5,622 7,389 9,913
Interest income 370 828 977 1,664
Income before taxes 2,739 6,450 8,366 11,577
Operating Segments | Security Products        
Net sales:        
Total net sales 18,573 26,927 44,042 51,631
Operating income (loss):        
Total operating income 3,361 6,048 9,074 11,124
Operating Segments | Marine Components        
Net sales:        
Total net sales 5,227 6,803 12,069 13,276
Operating income (loss):        
Total operating income 799 1,280 1,881 2,181
Corporate        
Operating income (loss):        
Total operating income $ (1,791) $ (1,706) $ (3,566) $ (3,392)