INDUSTRY SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Oct. 01, 2016 USD ($)	Sep. 30, 2017 USD ($) company item	Oct. 01, 2016 USD ($)	Dec. 31, 2016 USD ($)
INDUSTRY SEGMENT INFORMATION
Number of industry groups in which the entity operates | item			2
Number of reportable segments | item			2
Number of companies that comprise TMC | company			3
Revenues from external customers	$ 38,627	$ 37,647	$ 112,617	$ 114,596
Depreciation, depletion and amortization	617	607	1,932	1,897
Operating income (loss)	1,318	1,361	2,362	5,043
Segment assets (a)	85,195	78,008	85,195	78,008	$ 78,008
Capital expenditures (b)	1,575	841	4,378	3,617
Unallocated Corporate
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	4	3	13	12
Depreciation, depletion and amortization	8	3	24	11
Operating income (loss)	(765)	(859)	(2,464)	(2,510)
Segment assets (a)	2,340	3,653	2,340	3,653
Capital expenditures (b)	(21)		14
Concrete Aggregates and Construction Supplies
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	18,054	18,156	49,650	51,267
Depreciation, depletion and amortization	316	316	1,026	1,020
Operating income (loss)	1,602	1,010	2,484	2,881
Segment assets (a)	40,013	33,518	40,013	33,518
Capital expenditures (b)	1,148	565	3,367	2,798
Doors
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	4,936	4,467	13,565	13,212
Depreciation, depletion and amortization	39	32	111	95
Operating income (loss)	600	543	1,544	1,390
Segment assets (a)	7,617	6,173	7,617	6,173
Capital expenditures (b)	12	54	131	106
Heating and Cooling
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	10,144	9,605	27,358	27,390
Depreciation, depletion and amortization	147	138	449	415
Operating income (loss)	151	408	219	1,205
Segment assets (a)	24,764	22,381	24,764	22,381
Capital expenditures (b)	285	208	650	584
Evaporative Cooling
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	5,489	5,416	22,031	22,715
Depreciation, depletion and amortization	107	118	322	356
Operating income (loss)	(270)	259	579	2,077
Segment assets (a)	10,461	12,283	10,461	12,283
Capital expenditures (b)	151	14	216	129
Combined Construction Products
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	22,990	22,623	63,215	64,479
Depreciation, depletion and amortization	355	348	1,137	1,115
Operating income (loss)	2,202	1,553	4,028	4,271
Segment assets (a)	47,630	39,691	47,630	39,691
Capital expenditures (b)	1,160	619	3,498	2,904
Combined HVAC Products
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	15,633	15,021	49,389	50,105
Depreciation, depletion and amortization	254	256	771	771
Operating income (loss)	(119)	667	798	3,282
Segment assets (a)	35,225	34,664	35,225	34,664
Capital expenditures (b)	$ 436	$ 222	$ 866	$ 713