NATURE OF OPERATIONS AND ACCOUNTING POLICIES. (Details 7) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010
Segment Information
Net sales	$ 286,140,112	$ 300,360,689	$ 221,150,099
Specialized vehicles
Segment Information
Number of product categories	3
Net sales	283,177,017	298,073,409	217,301,673
Specialized vehicles | Trucks
Segment Information
Net sales	211,971,626	218,927,753	122,489,740
Specialized vehicles | Buses
Segment Information
Net sales	55,025,147	60,640,186	69,951,326
Specialized vehicles | Armored vehicles
Segment Information
Net sales	16,180,244	18,505,470	24,860,607
Fiberglass products
Segment Information
Net sales	$ 2,963,095	$ 2,287,280	$ 3,848,426