INDUSTRY SEGMENT INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013 item	Sep. 29, 2012	Dec. 29, 2012
INDUSTRY SEGMENT INFORMATION
Number of industry groups in which the entity operates			2
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	$ 28,865	$ 29,166	$ 87,935	$ 83,309
Depreciation, depletion and amortization	669	825	2,328	2,938
Operating (loss) income	(337)	(165)	(1,096)	(2,329)
Segment assets	70,375	71,545	70,375	71,545	71,545
Capital expenditures	1,183	853	1,999	1,487
Concrete, Aggregates & Construction Supplies
INDUSTRY SEGMENT INFORMATION
Number of companies			3
Revenues from external customers	11,801	12,659	31,395	29,332
Depreciation, depletion and amortization	431	579	1,616	2,169
Operating (loss) income	(707)	(187)	(2,829)	(3,208)
Segment assets	32,216	31,629	32,216	31,629
Capital expenditures	792	500	939	697
Doors
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	3,991	3,083	12,117	9,535
Depreciation, depletion and amortization	31	33	93	100
Operating (loss) income	382	88	992	427
Segment assets	6,660	5,767	6,660	5,767
Capital expenditures	18	9	57	26
Heating and Cooling
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	6,876	7,672	21,965	22,545
Depreciation, depletion and amortization	103	108	309	316
Operating (loss) income	83	258	1,297	466
Segment assets	17,937	17,054	17,937	17,054
Capital expenditures	136	135	520	330
Evaporative Cooling
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	6,193	5,662	22,419	21,628
Depreciation, depletion and amortization	90	97	269	282
Operating (loss) income	575	394	2,418	2,101
Segment assets	11,209	12,250	11,209	12,250
Capital expenditures	237	206	477	425
Unallocated Corporate
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	4	4	10	11
Depreciation, depletion and amortization	14	8	41	71
Operating (loss) income	(654)	(672)	(2,184)	(1,928)
Segment assets	2,353	3,839	2,353	3,839
Capital expenditures		3	6	9
Other
INDUSTRY SEGMENT INFORMATION
Revenues from external customers		86	29	258
Operating (loss) income	(16)	(46)	(790)	(187)
Segment assets		1,006		1,006
Construction Products
INDUSTRY SEGMENT INFORMATION
Number of reportable segments			2
Revenues from external customers	15,792	15,742	43,512	38,867
Depreciation, depletion and amortization	462	612	1,709	2,269
Operating (loss) income	(325)	(99)	(1,837)	(2,781)
Segment assets	38,876	37,396	38,876	37,396
Capital expenditures	810	509	996	723
HVAC Products
INDUSTRY SEGMENT INFORMATION
Number of reportable segments			2
Revenues from external customers	13,069	13,334	44,384	44,173
Depreciation, depletion and amortization	193	205	578	598
Operating (loss) income	658	652	3,715	2,567
Segment assets	29,146	29,304	29,146	29,304
Capital expenditures	$ 373	$ 341	$ 997	$ 755