NATURE OF OPERATIONS AND ACCOUNTING POLICIES. (Details 7) (USD $)	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Segment Information
Net sales	$ 236,308,920	$ 246,805,967	$ 239,110,863
Specialized Vehicles
Segment Information
Number of product categories	3
Net sales	234,182,656	244,636,013	236,147,768
Specialized Vehicles | Trucks
Segment Information
Net sales	211,975,917	225,778,360	211,971,626
Specialized Vehicles | Trolley
Segment Information
Net sales	8,414,833	6,928,018	7,995,898
Specialized Vehicles | Specialty Vehicles
Segment Information
Net sales	13,791,906	11,929,635	16,180,244
Fiberglass Products
Segment Information
Net sales	$ 2,126,264	$ 2,169,954	$ 2,963,095