INDUSTRY SEGMENT INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013 item	Jun. 30, 2012	Dec. 29, 2012
INDUSTRY SEGMENT INFORMATION
Number of industry groups in which the entity operates			2
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	$ 32,857	$ 29,747	$ 59,070	$ 54,143
Depreciation, depletion and amortization	844	1,045	1,659	2,113
Operating (loss) income	374	(629)	(759)	(2,164)
Segment assets	71,134	71,545	71,134	71,545	71,545
Capital expenditures	397	377	816	634
Concrete, Aggregates & Construction Supplies
INDUSTRY SEGMENT INFORMATION
Number of companies			3
Revenues from external customers	11,777	9,930	19,594	16,673
Depreciation, depletion and amortization	607	785	1,185	1,590
Operating (loss) income	(174)	(1,256)	(2,122)	(3,021)
Segment assets	31,126	31,629	31,126	31,629
Capital expenditures	51	121	147	197
Doors
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	4,401	3,522	8,126	6,452
Depreciation, depletion and amortization	31	34	62	67
Operating (loss) income	494	281	610	339
Segment assets	6,317	5,767	6,317	5,767
Capital expenditures	3	9	39	17
Heating and Cooling
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	5,530	6,007	15,089	14,873
Depreciation, depletion and amortization	103	108	206	208
Operating (loss) income	(80)	(291)	1,214	208
Segment assets	15,440	17,054	15,440	17,054
Capital expenditures	318	86	384	195
Evaporative Cooling
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	11,145	10,198	16,226	15,966
Depreciation, depletion and amortization	89	87	179	185
Operating (loss) income	1,602	1,338	1,843	1,707
Segment assets	12,580	12,250	12,580	12,250
Capital expenditures	34	159	240	219
Unallocated Corporate
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	4	4	6	7
Depreciation, depletion and amortization	14	31	27	63
Operating (loss) income	(806)	(629)	(1,530)	(1,256)
Segment assets	5,046	3,839	5,046	3,839
Capital expenditures	(9)	2	6	6
Other
INDUSTRY SEGMENT INFORMATION
Revenues from external customers		86	29	172
Operating (loss) income	(662)	(72)	(774)	(141)
Segment assets	625	1,006	625	1,006
Construction Products
INDUSTRY SEGMENT INFORMATION
Number of reportable segments			2
Revenues from external customers	16,178	13,452	27,720	23,125
Depreciation, depletion and amortization	638	819	1,247	1,657
Operating (loss) income	320	(975)	(1,512)	(2,682)
Segment assets	37,443	37,396	37,443	37,396
Capital expenditures	54	130	186	214
HVAC Products
INDUSTRY SEGMENT INFORMATION
Number of reportable segments			2
Revenues from external customers	16,675	16,205	31,315	30,839
Depreciation, depletion and amortization	192	195	385	393
Operating (loss) income	1,522	1,047	3,057	1,915
Segment assets	28,020	29,304	28,020	29,304
Capital expenditures	$ 352	$ 245	$ 624	$ 414