DISPOSITION OF ASSETS (Details) - USD ($)	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Feb. 01, 2019	Jan. 15, 2019	Dec. 29, 2018	Jun. 30, 2015
Disposition of assets.
Escrow Deposit	$ 2,500,000			$ 200,000	$ 2,500,000	$ 2,500,000
The results of discontinued operations
Income tax provision (benefit)	1,562,000	$ 167,000
Income (loss) from discontinued operations	4,222,000	(503,000)
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
Revenue	4,058,000	13,463,000
Costs and expenses	3,900,000	12,940,000
Depreciation, depletion and amortization	578,000	271,000
Selling and administrative	304,000	922,000
Pre-tax income (loss)	5,784,000	(670,000)
The results of discontinued operations
Operating (loss)	(724,000)	(670,000)
Gain on sale of assets	6,508,000
Income tax provision (benefit)	1,562,000	(167,000)
Income (loss) from discontinued operations	$ 4,222,000	$ (503,000)