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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 28, 2012
Dec. 30, 2011
Current deferred tax assets (liabilities):    
Allowance for doubtful accounts and sales returns $ 89 $ 90
Inventories 190 270
Accrued vacation 534 490
Other (111) (110)
State taxes 3 3
Accrued legal judgment and other accrued expenses 187 211
Valuation allowance (1,331) (1,426)
Total current deferred tax liabilities (439) (472)
Non-current deferred tax assets (liabilities):    
Net operating loss carryforwards 51,533 51,334
Stock-based payments 1,602 1,311
Valuation allowance (49,762) (50,145)
Total non-current deferred tax liabilities (698) (556)
Business Foreign and Amt Credit Carryforwards [Member]
    
Non-current deferred tax assets (liabilities):    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other 844 788
Capitalized Rd [Member]
    
Non-current deferred tax assets (liabilities):    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other 605 597
Contributions [Member]
    
Non-current deferred tax assets (liabilities):    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other 58 160
Pensions [Member]
    
Non-current deferred tax assets (liabilities):    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other 877 812
Depreciation and Amortization [Member]
    
Non-current deferred tax assets (liabilities):    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other 202 54
Foreign Tax Withholding [Member]
    
Non-current deferred tax assets (liabilities):    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other (885) (711)
Foreign Earnings Not Permanently Reinvested [Member]
    
Non-current deferred tax assets (liabilities):    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other (5,783) (4,789)
Others [Member]
    
Non-current deferred tax assets (liabilities):    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other $ 11 $ 33