Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 29, 2012	Dec. 31, 2011
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 100,000	$ 200,000
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, authorized shares	1,000,000	1,000,000
Preferred stock, issued shares	0	0
Ratio for converting shares of Class B common stock into shares of Class A common stock, numerator (in Class A shares)	1	1
Ratio for converting shares of Class B common stock into shares of Class A common stock, denominator (in Class B shares)	1	1
Treasury stock, shares	1,893,446	2,243,446
Class A Common Stock
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, authorized shares	20,000,000	20,000,000
Common stock, issued shares	15,417,656	15,330,614
Class B Common Stock
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, authorized shares	5,000,000	5,000,000
Common stock, issued shares	1,716,937	1,716,937