BUSINESS DISPOSITION (Details) (USD $)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 27, 2014	Sep. 27, 2014 T	Jan. 03, 2015 T
BUSINESS DISPOSITIONS
Number of years in which income earned from operations, since 2005			2 years
Royalties recoverable pending outcome of litigation			$ 1,259,000
Pueblo Colorado gravel operations
BUSINESS DISPOSITIONS
Costs to backfill the mined gravel			4,000,000
Write off of unamortized deferred development expenses	1,257,000		1,257,000
Write off of prepaid royalties	401,000		401,000
Royalties recoverable pending outcome of litigation			1,259,000
Sand and gravel reserves (in tons)			50,000,000
Sand and gravel tons paid for		17,500,000
Reserve on overpaid royalties		0
Remaining Unmined Sand And Gravel		$ 32,500,000