DISCONTINUED OPERATIONS. (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 29, 2014	Dec. 27, 2014	Dec. 28, 2013
Discontinued operations
Net proceeds from sale of assets		$ 3,884,656
Gain on sale of business, net of tax		87,036
Operating results
Net loss		(1,654,459)	$ (4,772,386)
Shuttle Bus Division
Discontinued operations
Products sales expressed as a percentage of consolidated sales			13.00%
Net proceeds from sale of assets	$ 3,900,000
Inventory	4,100,000
Machinery and equipment	200,000
Reduction in proceeds due to warranty obligation	500,000
Gain on sale of business, net of tax	$ 100,000
Period for which the entity will not compete under asset purchase agreement	5 years
Operating results
Net sales		6,549,209	$ 35,467,332
Pretax loss from operations		(2,306,655)	(7,836,430)
Net loss		$ (1,567,423)	$ (4,772,386)