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Business Segment Information - Schedule of Business Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Net sales:    
Total net sales $ 27,075 $ 27,891
Operating income (loss):    
Total operating income 3,353 3,700
Interest income 32 9
Income before taxes 3,385 3,709
Operating Segments | Security Products    
Net sales:    
Total net sales 23,414 24,658
Operating income (loss):    
Total operating income 4,471 4,946
Operating Segments | Marine Components    
Net sales:    
Total net sales 3,661 3,233
Operating income (loss):    
Total operating income 334 259
Corporate    
Operating income (loss):    
Total operating income $ (1,452) $ (1,505)