Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jun. 28, 2013	Dec. 28, 2012
Accounts receivable, allowance for contract losses and doubtful accounts	$ 2,702	$ 2,666
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000	100,000
Common stock, shares issued	16,427	16,427
Treasury stock, shares	3,294	3,221