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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
Jan. 03, 2014
Dec. 28, 2012
Current deferred tax assets (liabilities):    
Allowance for doubtful accounts and sales returns $ 21 $ 89
Inventories 11 190
Accrued vacation 375 534
State taxes 0 3
Other (137) (111)
Valuation allowance (741) (1,331)
Accrued other expenses 105 187
Total current deferred tax liabilities (366) (439)
Non-current deferred tax assets (liabilities):    
Net operating loss carryforwards 50,409 51,533
Stock-based compensation 2,212 1,602
Business, foreign and AMT credit carryforwards 921 844
Capitalized R&D 525 605
Contributions 57 58
Pensions 731 877
Depreciation and amortization 360 202
Foreign tax withholding (1,129) (885)
Foreign earnings not permanently reinvested (4,992) (5,783)
Other (40) 11
Valuation allowance (50,082) (49,762)
Total non-current deferred tax liabilities $ (1,028) $ (698)