v2.4.0.8
Product Warranties - Activity in Product Warranty Reserves (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 28, 2014
Jun. 28, 2014
Guarantees [Abstract]    
Balance at beginning of period $ 1,105,000 $ 1,185,000
Warranty charges 403,942 777,784
Warranty payments (363,942) (817,784)
Balance at end of period $ 1,145,000 $ 1,145,000