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Income Taxes (Details 2) - USD ($)
$ in Thousands
Jan. 01, 2016
Jan. 02, 2015
Current deferred tax assets (liabilities):    
Allowance for doubtful accounts and sales returns $ 90 $ 127
Inventories 422 511
Accrued vacation 382 397
Accrued other expenses 176 119
Other 57 80
Valuation allowance (1,058) (939)
Total current deferred tax assets (liabilities) 69 295
Non-current deferred tax assets (liabilities):    
Net operating loss carryforwards 51,005 53,747
Stock-based compensation 1,763 1,684
Business, foreign and AMT credit carryforwards 1,730 1,223
Capitalized R&D 134 423
Contributions 17 37
Pensions 583 489
Depreciation and amortization 695 870
Foreign tax withholding (1,627) (1,326)
Foreign earnings not permanently reinvested (3,209) (5,022)
Other 13 31
Valuation allowance (52,275) (53,165)
Total non-current deferred tax liabilities $ (1,171) $ (1,009)