DISPOSITIONS OF ASSETS (Details) - USD ($)	3 Months Ended		12 Months Ended
	Jun. 29, 2019	Mar. 30, 2019	Dec. 28, 2019	Dec. 29, 2018	Feb. 01, 2019	Jan. 15, 2019	Jul. 31, 2015
Disposition of assets.
Escrow Deposit						$ 218,000	$ 2,500,000
Revenue, expenses and pre-tax income reclassified to discontinued operations
Revenue			$ 4,058,000	$ 63,096,000
Costs and expenses			3,900,000	58,143,000
Depreciation, depletion and amortization			578,000	1,161,000
Selling and administrative			304,000	3,550,000
Gain on sales of equipment				919,000
Pre-tax income			4,559,000	1,161,000
The results of discontinued operations
Gain on sale of assets			5,283,000
Income tax provision			(1,080,000)	(315,000)
Income from discontinued operations			3,479,000	846,000
Transit Mix Concrete | Discontinued operation
Disposition of assets.
Sale price					$ 27,129,000
Escrow Deposit			2,049,000
Payment as working capital adjustment	$ 1,248,000
The results of discontinued operations
Operating (loss) income			(724,000)	1,161,000
Gain on sale of assets		$ 6,508,000	5,283,000
Income tax provision			(1,080,000)	(315,000)
Income from discontinued operations			$ 3,479,000	$ 846,000