DISCONTINUED OPERATIONS (Details) - Pueblo Colorado gravel operations			1 Months Ended	3 Months Ended
	Sep. 30, 2016 USD ($) item	Sep. 15, 2016 USD ($) T	Oct. 01, 2016 USD ($)	Sep. 27, 2014 USD ($) T
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sand and gravel reserves (in tons) | T		50,000,000
Royalty overpayments		$ 1,282,000
Write off of prepaid royalties			$ 632,000
Number of counterclaims | item	3
Sand and gravel tons paid for | T				17,700,000
Overpayment of sand and gravel reserve				$ 50,000,000
Minimum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount of damages sought	$ 5,900,000