EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Sep. 24, 2011	Sep. 29, 2012	Sep. 24, 2011
Numerator [Abstract]
Net earnings	$ 4,198	$ 5,616	$ 25,862	$ 6,223
Adjustment for earnings allocated to non-vested restricted common stock	(38)	(45)	(225)	(52)
Net earnings for calculating EPS	$ 4,160	$ 5,571	$ 25,637	$ 6,171
Denominator [Abstract]
Weighted average shares outstanding (in shares)	19,827,000	19,597,000	19,783,000	19,551,000
Adjustment for non-vested restricted common stock (in shares)	(178,000)	(156,000)	(172,000)	(164,000)
Shares for calculating basic EPS (in shares)	19,649,000	19,441,000	19,611,000	19,387,000
Effect of dilutive stock options (in shares)	25,000	33,000	19,000	55,000
Shares for calculating diluted EPS (in shares)	19,674,000	19,474,000	19,630,000	19,442,000
Net earnings per share [Abstract]
Basic (in dollars per share)	$ 0.21	$ 0.29	$ 1.31	$ 0.32
Diluted (in dollars per share)	$ 0.21	$ 0.29	$ 1.31	$ 0.32
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options to purchase shares excluded from computation of EPS (in shares)	0	110,000	10,000	10,000