Shareholders' Equity (Details) (USD $)			3 Months Ended
	Mar. 30, 2013 2005 Plan	Dec. 31, 2005 2005 Plan	Mar. 30, 2013 Restricted stock	Mar. 31, 2012 Restricted stock	Mar. 30, 2013 Restricted stock Minimum	Mar. 30, 2013 Restricted stock Maximum	Mar. 30, 2013 Stock options	Mar. 31, 2012 Stock options	Mar. 30, 2013 Stock options Minimum	Mar. 30, 2013 Stock options Maximum	Mar. 30, 2013 Stock options Employees	Mar. 30, 2013 Stock options Board of Directors	Mar. 30, 2013 Stock option granted prior to May 2008	Mar. 30, 2013 Stock option granted prior to May 2008 Employees	Mar. 30, 2013 Stock option granted prior to May 2008 Board of Directors
Shareholders equity
Number of shares reserved for issuance but unissued		410,518
Number of shares authorized	2,710,518
Expiration term of awards							10 years						5 years
Vesting period					1 year	3 years			5 years	10 years	5 years	1 year		5 years	1 year
Number of Shares
Outstanding at the beginning of the period (in shares)			519,437
Vested (in shares)			(99,140)
Forfeited (in shares)			(100,860)
Outstanding at the end of the period (in shares)			319,437
Weighted Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share)			$ 4.64
Vested (in dollars per share)			$ 3.39
Forfeited (in dollars per share)			$ 3.39
Outstanding at the end of the period (in dollars per share)			$ 5.42
Options Outstanding
Outstanding at the beginning of the period (in shares)							1,222,727
Granted (in shares)							5,000
Exercised (in shares)							(218,227)
Outstanding at the end of the period (in shares)							1,009,500
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)							$ 3.26
Granted (in dollars per share)							$ 7.38
Exercised (in dollars per share)							$ 1.84
Outstanding at the end of the period (in dollars per share)							$ 3.59
Aggregate Intrinsic Value (in-the-money option)
Intrinsic value related to options outstanding							$ 4,233,043
Closing stock price (in dollars per share)							$ 7.78
Weighted Average Remaining Contractual Life
Weighted Average Remaining Contractual Life							6 years 10 months 24 days
Additional disclosures
Share-based compensation expense			100,000	200,000			100,000	100,000
Unrecognized costs related to non-vested stock option awards granted			600,000
Weighted average period for recognition of unrecognized compensation costs			1 year 1 month 6 days				2 years 6 months
Unrecognized costs related to non-vested awards granted							$ 800,000
Weighted-average assumptions used to estimate fair value of each stock option grant
Expected volatility (as a percent)							55.00%
Risk-free interest rate (as a percent)							1.90%
Expected life							6 years 6 months