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Business Segment Information - Schedule of Business Segment Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Net sales:        
Total net sales $ 26,848 $ 24,039 $ 52,629 $ 45,492
Operating income:        
Total operating income 3,912 2,943 7,200 4,377
Interest income 7 11 12 27
Interest expense   (58)   (117)
Income before taxes 3,919 2,896 7,212 4,287
Corporate, Non-Segment
        
Operating income:        
Total operating income (1,451) (1,844) (2,847) (3,492)
Security Products | Operating Segments
        
Net sales:        
Total net sales 23,045 20,826 46,009 39,800
Operating income:        
Total operating income 4,842 4,475 9,542 7,667
Marine Components | Operating Segments
        
Net sales:        
Total net sales 3,803 3,213 6,620 5,692
Operating income:        
Total operating income $ 521 $ 312 $ 505 $ 202