Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 26, 2011
Condensed Consolidated Balance Sheets [Abstract]
Allowances for trade and other accounts receivable	$ 464	$ 679	$ 426
Accumulated depreciation for property and equipment	$ 15,995	$ 15,092	$ 12,675
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000	50,000,000
Common stock, shares issued	6,717,627	6,717,627	6,717,627
Treasury stock, shares	208,065	213,003	217,759