NATURE OF OPERATIONS AND ACCOUNTING POLICIES - SBC & Warranty (Details) - USD ($)	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Stock-Based Compensation
Stock-based compensation expense	$ 778,223	$ 488,277	$ 402,363
Stock options issued (in shares)	0	0	0
Warranty activity
Accrued warranty, beginning of year	$ 949,000	$ 1,432,000	$ 1,609,000
Warranty expense	1,050,955	605,413	1,170,983
Warranty claims paid	(944,955)	(589,413)	(1,347,983)
Shuttle bus divestiture		(499,000)
Accrued warranty, end of year	$ 1,055,000	$ 949,000	$ 1,432,000
Maximum period of product warranty from date of retail sale	5 years