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Business Segment Information - Schedule of Business Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Net sales:        
Total net sales $ 26,992 $ 28,404 $ 86,943 $ 82,586
Operating income (loss):        
Total operating income 3,368 4,473 12,494 11,543
Interest income 546 88 1,363 161
Income before taxes 3,914 4,561 13,857 11,704
Operating Segments | Security Products        
Net sales:        
Total net sales 22,854 24,680 74,903 71,289
Operating income (loss):        
Total operating income 4,249 5,421 15,301 14,676
Operating Segments | Marine Components        
Net sales:        
Total net sales 4,138 3,724 12,040 11,297
Operating income (loss):        
Total operating income 417 547 1,284 1,436
Corporate        
Operating income (loss):        
Total operating income $ (1,298) $ (1,495) $ (4,091) $ (4,569)