INDUSTRY SEGMENT INFORMATION (Details) (USD $)	3 Months Ended
	Mar. 30, 2013 item	Mar. 31, 2012	Dec. 29, 2012
INDUSTRY SEGMENT INFORMATION
Number of industry groups in which the entity operates	2
INDUSTRY SEGMENT INFORMATION
Severance cost related to sole employee	$ 0
Revenues from external customers	26,213,000	24,396,000
Depreciation, depletion and amortization	815,000	1,068,000
Operating (loss) income	(1,133,000)	(1,534,000)
Segment assets	71,088,000	71,545,000	71,545,000
Capital expenditures	419,000	257,000
Concrete, Aggregates & Construction Supplies
INDUSTRY SEGMENT INFORMATION
Number of companies	3
Revenues from external customers	7,817,000	6,743,000
Depreciation, depletion and amortization	578,000	805,000
Operating (loss) income	(1,948,000)	(1,765,000)
Segment assets	30,737,000	31,629,000
Capital expenditures	96,000	76,000
Doors
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	3,725,000	2,930,000
Depreciation, depletion and amortization	31,000	33,000
Operating (loss) income	116,000	59,000
Segment assets	6,729,000	5,767,000
Capital expenditures	36,000	8,000
Heating and Cooling
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	9,559,000	8,866,000
Depreciation, depletion and amortization	103,000	100,000
Operating (loss) income	1,295,000	499,000
Segment assets	14,469,000	17,054,000
Capital expenditures	66,000	109,000
Evaporative Cooling
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	5,081,000	5,768,000
Depreciation, depletion and amortization	90,000	98,000
Operating (loss) income	240,000	369,000
Segment assets	15,677,000	12,250,000
Capital expenditures	206,000	60,000
Unallocated Corporate
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	2,000	3,000
Depreciation, depletion and amortization	13,000	32,000
Operating (loss) income	(710,000)	(627,000)
Segment assets	2,496,000	3,839,000
Capital expenditures	15,000	4,000
Other
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	29,000	86,000
Operating (loss) income	(126,000)	(69,000)
Segment assets	980,000	1,006,000
Construction Products
INDUSTRY SEGMENT INFORMATION
Number of reportable segments	2
Revenues from external customers	11,542,000	9,673,000
Depreciation, depletion and amortization	609,000	838,000
Operating (loss) income	(1,832,000)	(1,706,000)
Segment assets	37,466,000	37,396,000
Capital expenditures	132,000	84,000
HVAC Products
INDUSTRY SEGMENT INFORMATION
Number of reportable segments	2
Revenues from external customers	14,640,000	14,634,000
Depreciation, depletion and amortization	193,000	198,000
Operating (loss) income	1,535,000	868,000
Segment assets	30,146,000	29,304,000
Capital expenditures	$ 272,000	$ 169,000