DISCONTINUED OPERATIONS (Details)	1 Months Ended	3 Months Ended
	Sep. 27, 2014 USD ($)	Sep. 27, 2014 USD ($) T
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of years in which income earned from operations, since 2005	2 years
Pueblo Colorado gravel operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Costs to backfill the mined gravel		$ 4,000,000
Write off of unamortized deferred development expenses		1,257,000
Write off of prepaid royalties		401,000
Royalty overpayments		1,282,000
Royalties paid in excess	$ 1,470,000	$ 1,470,000
Sand and gravel reserves (in tons) | T		50,000,000
Sand and gravel tons paid for | T		17,700,000
Reserve on overpaid royalties		$ 0
Remaining Unmined Sand and Gravel (in tons) | T		32,300,000