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Stock Based Compensation (Details Textual)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 29, 2013
USD ($)
OptionPlan
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Jun. 29, 2013
USD ($)
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Jun. 30, 2012
USD ($)
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Jun. 29, 2013
Director Equity Plan [Member]
USD ($)
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Jun. 30, 2012
Director Equity Plan [Member]
USD ($)
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Jun. 29, 2013
2006 Stock Option Plan [Member]
Awards
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Jun. 29, 2013
2006 Stock Option Plan [Member]
Maximum [Member]
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Jun. 29, 2013
2001 Restricted Stock Plan [Member]
USD ($)
|
Jun. 30, 2012
2001 Restricted Stock Plan [Member]
USD ($)
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Jun. 29, 2013
Equity Incentive Plan (2011 Plan) [Member]
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Jun. 29, 2013
Employee Stock Purchase Plan [Member]
USD ($)
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Jun. 30, 2012
Employee Stock Purchase Plan [Member]
USD ($)
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Jun. 29, 2013
Employee Stock Purchase Plan [Member]
Minimum [Member]
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Jun. 29, 2013
Employee Stock Purchase Plan [Member]
Minimum [Member]
United States [Member]
USD ($)
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Jun. 29, 2013
Employee Stock Purchase Plan [Member]
Minimum [Member]
United Kingdom [Member]
GBP (£)
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Jun. 29, 2013
Employee Stock Purchase Plan and U.K. Plan [Member]
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Jun. 29, 2013
Nonemployee Director Equity and Deferred Compensation Plan [Member]
USD ($)
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| Stock Option Plans (Textual) [Abstract] | |||||||||||||||||
| Shares available for issuance | 25,000 | 1,125,000 | 928,125 | 248,249 | |||||||||||||
| Exercise price per share not less than fair value percent | 110.00% | ||||||||||||||||
| Exercise price per share more than voting stock | 10.00% | ||||||||||||||||
| Stock options maximum term (in years) | 10 years | ||||||||||||||||
| Number of awards granted under 2006 plan | 0 | ||||||||||||||||
| Minimum period before shares become non-forfeitable (in months) | 6 months | ||||||||||||||||
| Plan Expiration year | 2011 | ||||||||||||||||
| Aggregate shares of restricted stock grant | 0 | 1,000,000 | 1,096,875 | ||||||||||||||
| Remaining number of shares to be issued | 270,000 | 823,712 | 693,081 | ||||||||||||||
| Restricted stock expense | $ 1,038,000 | $ 835,000 | |||||||||||||||
| Total unrecognized compensation | 2,613,000 | 2,613,000 | |||||||||||||||
| Number of plan under which restricted stock unit granted | 2 | ||||||||||||||||
| Recognized weighted average period (in years) | 1 year 1 month 10 days | ||||||||||||||||
| Rate of common stock at market value | 85.00% | ||||||||||||||||
| Ratio for additional common stock shares issued, under ESPP | 6 | ||||||||||||||||
| Shares allowed to be purchased by U.S. employees and U.K. employees | 25,000 | 1,500 | |||||||||||||||
| Allowable purchase rate of common stock based on annual salary | 10.00% | ||||||||||||||||
| Number of shares purchased by employees | 20,203 | 17,593 | |||||||||||||||
| Weighted average price | $ 23.08 | $ 18.92 | |||||||||||||||
| Share based Compensation Expenses | 112,000 | 101,000 | |||||||||||||||
| Stock option granted, shares | 8,500 | 8,266 | 375 | ||||||||||||||
| Cash fees paid | 3,000 | ||||||||||||||||
| Fee for the chairs of each Board committee | 125.00% | 25.00% | |||||||||||||||
| Deferred stock units outstanding | 0 | 0 | |||||||||||||||
| Common stock shares for each nonemployee director | 500 | ||||||||||||||||
| Share based Compensation Expenses under Director's plan | $ 288,000 | $ 218,000 | |||||||||||||||