CESSATION OF MINING AT LEASED PUEBLO GRAVEL SITE (Details)	3 Months Ended	9 Months Ended	12 Months Ended	105 Months Ended
	Sep. 27, 2014 USD ($)	Sep. 27, 2014 USD ($) T	Jan. 02, 2016 USD ($) T	Sep. 27, 2014
CESSATION OF MINING AT LEASED PUEBLO GRAVEL SITE
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
CESSATION OF MINING AT LEASED PUEBLO GRAVEL SITE
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
Royalties recoverable pending outcome of litigation			1,282,000
Royalties paid in excess			$ 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