SALE OF TMC ASSETS (Details) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Feb. 01, 2019	Jan. 15, 2019	Jul. 31, 2015
Disposition of assets.
Escrow Deposit								$ 200,000	$ 2,500,000
Payment as working capital adjustment		$ 1,248,000
Revenue, expenses and pre-tax income reclassified to discontinued operations
Revenue				$ 17,013,000	$ 4,058,000	$ 48,219,000
Costs and expenses				16,005,000	3,900,000	44,457,000
Depreciation, depletion and amortization				288,000	578,000	862,000
Selling and administrative				907,000	304,000	2,718,000
Gain on sales of equipment				3,000		892,000
(Loss) gain on sale of assets					5,283,000
Pre-tax (loss) income				(184,000)	4,559,000	1,075,000
The results of discontinued operations
Operating income (loss)				(184,000)
(Loss) gain on sale of assets					5,283,000
Income tax (benefit) provision	$ 0			(46,000)	1,255,000	268,000
Loss (income) from discontinued operations				$ (138,000)	3,304,000	806,000
Transit Mix Concrete | Discontinued operation
Disposition of assets.
Sale price							$ 27,129,000
Escrow Deposit							$ 2,049,000
Revenue, expenses and pre-tax income reclassified to discontinued operations
(Loss) gain on sale of assets			$ 6,508,000		5,283,000
The results of discontinued operations
Operating income (loss)					(724,000)	1,075,000
(Loss) gain on sale of assets			$ 6,508,000		5,283,000
Income tax (benefit) provision					1,255,000	268,000
Loss (income) from discontinued operations					$ 3,304,000	$ 806,000