INDUSTRY SEGMENT INFORMATION (Details)	3 Months Ended		9 Months Ended
	Sep. 28, 2019 USD ($)	Sep. 29, 2018 USD ($)	Sep. 28, 2019 USD ($) segment company	Sep. 29, 2018 USD ($)	Dec. 29, 2018 USD ($)
INDUSTRY SEGMENT INFORMATION
Number of operating segments | segment			4
Number of reportable segments | segment			3
Number of companies that comprise TMC | company			3
Revenues from external customers	$ 31,987,000	$ 23,965,000	$ 79,773,000	$ 72,932,000
Depreciation, depletion and amortization	597,000	393,000	1,369,000	1,203,000
Operating income (loss)	(27,906,000)	(1,268,000)	(20,949,000)	(7,777,000)
Segment assets	92,496,000	75,703,000	92,496,000	75,703,000	$ 75,703,000
Capital expenditures	525,000	575,000	973,000	963,000
Reclamation liability related to Pikeview aggregates quarry	20,217,000		20,217,000
Held for Sale
INDUSTRY SEGMENT INFORMATION
Segment assets		24,036,000		24,036,000
Unallocated Corporate
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	(16,000)	35,000	0	68,000
Depreciation, depletion and amortization	26,000	10,000	54,000	33,000
Operating income (loss)	(1,412,000)	(1,309,000)	(6,295,000)	(3,208,000)
Segment assets	$ 15,550,000	3,346,000	15,550,000	3,346,000
Capital expenditures		(5,000)	15,000	46,000
Minimum
INDUSTRY SEGMENT INFORMATION
Expected reclamation period	5 years
HVAC
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	$ 23,702,000	17,163,000	57,712,000	52,294,000
Depreciation, depletion and amortization	320,000	268,000	842,000	809,000
Operating income (loss)	1,499,000	(511,000)	(837,000)	83,000
Segment assets	53,540,000	29,003,000	53,540,000	29,003,000
Capital expenditures	286,000	377,000	479,000	642,000
Doors
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	6,787,000	4,746,000	17,483,000	14,824,000
Depreciation, depletion and amortization	111,000	41,000	199,000	123,000
Operating income (loss)	295,000	431,000	1,288,000	1,787,000
Segment assets	13,607,000	8,003,000	13,607,000	8,003,000
Capital expenditures	(36,000)	61,000	72,000	94,000
Construction Materials
INDUSTRY SEGMENT INFORMATION
Revenues from external customers	1,515,000	2,021,000	4,579,000	5,746,000
Depreciation, depletion and amortization	142,000	74,000	276,000	238,000
Operating income (loss)	(28,288,000)	121,000	(15,105,000)	(6,439,000)
Segment assets	9,799,000	11,315,000	9,799,000	11,315,000
Capital expenditures	$ 275,000	$ 142,000	$ 407,000	$ 181,000