STOCKHOLDERS' EQUITY. (Details) (USD $)	12 Months Ended		12 Months Ended						12 Months Ended						12 Months Ended
	Dec. 29, 2012 item	Dec. 31, 2011	Dec. 29, 2012 Class A Common Stock	Dec. 31, 2011 Class A Common Stock	Dec. 25, 2010 Class A Common Stock	Oct. 29, 1998 The 1998 Stock Option Plan Class A Common Stock	Jan. 31, 2001 The 2001 Stock Option Plan Class A Common Stock	Jan. 23, 2004 The 2004 Stock Option Plan Class A Common Stock	Dec. 29, 2012 Stock options	Dec. 31, 2011 Stock options	Dec. 25, 2010 Stock options	Dec. 29, 2012 Stock options Minimum	Dec. 29, 2012 Stock options Maximum	May 23, 2012 Stock options Plan Class A Common Stock	Dec. 29, 2012 Stock options Plan Class A Common Stock Maximum
STOCKHOLDERS' EQUITY.
Preferred stock, authorized shares	1,000,000	1,000,000
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Conversion ratio of Class B common stock into shares of Class A common stock	1
Percentage of Board of Directors that holders of Class A common stock are entitled to elect	33.00%
Restricted Stock, additional disclosure
Shares available for grant						886,469	891,990	1,297,440						1,000,000
Expiration period												5 years	7 years
Vesting rights (as a percent)									33.33%
Number of shares that can be granted in any one year															100,000
Options
Outstanding at the beginning of the period (in shares)									1,156,621	1,204,715	1,246,082
Granted (in shares)											335,200
Exercised (in shares)			(58,804)	(26,920)	(1,766)				(58,804)	(32,726)	(1,766)
Expired (in shares)									(12,974)	(7,385)	(368,314)
Forfeited (in shares)									(125,035)	(7,983)	(6,487)
Outstanding at the end of the period (in shares)									959,808	1,156,621	1,204,715
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)									$ 3.90	$ 3.83	$ 5.00
Granted (in dollars per share)											$ 2.24
Exercised (in dollars per share)									$ 1.71	$ 1.48	$ 1.42
Expired (in dollars per share)									$ 6.15	$ 7.14	$ 6.33
Forfeited (in dollars per share)									$ 4.34	$ 1.51	$ 6.15
Outstanding at the end of the period (in dollars per share)									$ 3.93	$ 3.90	$ 3.83
Stock-based compensation, additional disclosure
Weighted-average grant date fair values of options granted (in dollars per share)											$ 1.16
Total intrinsic value of options exercised									$ 117,975	$ 47,152	$ 3,323
Unrecognized compensation expense
Total unrecognized compensation expense									$ 95,516
Recognition of unrecognized compensation expense over weighted average contractual life									8 months 26 days