NATURE OF OPERATIONS AND ACCOUNTING POLICIES. (Details 6) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Stock-Based Compensation
Stock-based compensation expense	$ 402,363	$ 294,195	$ 451,203
Stock options issued (in shares)	0	0	0
Warranty activity
Accrued warranty, beginning of year	1,609,000	1,588,000	1,636,000
Warranty expense	1,170,983	1,361,626	1,757,367
Warranty claims paid	(1,347,983)	(1,340,626)	(1,805,367)
Accrued warranty, end of year	$ 1,432,000	$ 1,609,000	$ 1,588,000
Maximum period of product warranty from date of retail sale	5 years