RENTAL EXPENSE, LEASES AND COMMITMENTS (Details) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011
RENTAL EXPENSE, LEASES AND COMMITMENTS
Rental expense	$ 2,031,000	$ 2,084,000
Future minimum rental commitments
2013	1,689,000
2014	1,664,000
2015	1,452,000
2016	1,304,000
2017	1,029,000
Thereafter	19,757,000
Aggregates property lease
Future minimum rental commitments
2013	474,000
2014	474,000
2015	474,000
2016	474,000
2017	474,000
Thereafter	19,432,000
Ground lease
Future minimum rental commitments
2013	235,000
2014	235,000
2015	235,000
2016	235,000
2017	$ 235,000