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Business Segment Information - Schedule of Business Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Net sales:        
Total net sales $ 30,002 $ 27,107 $ 59,950 $ 54,182
Operating income (loss):        
Total operating income 4,601 3,717 9,126 7,070
Interest income 482 41 817 73
Income before taxes 5,083 3,758 9,943 7,143
Operating Segments | Security Products        
Net sales:        
Total net sales 26,039 23,195 52,049 46,609
Operating income (loss):        
Total operating income 5,361 4,785 11,053 9,256
Operating Segments | Marine Components        
Net sales:        
Total net sales 3,963 3,912 7,901 7,573
Operating income (loss):        
Total operating income 495 555 866 889
Corporate        
Operating income (loss):        
Total operating income $ (1,255) $ (1,623) $ (2,793) $ (3,075)