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Income Taxes (Details 2) - USD ($)
$ in Thousands
Dec. 30, 2016
Jan. 01, 2016
Current deferred tax assets (liabilities):    
Allowance for doubtful accounts and sales returns $ 245 $ 90
Inventories 662 422
Accrued vacation 437 382
Accrued other expenses 596 176
Other 66 57
Valuation allowance (1,615) (1,058)
Total current deferred tax assets (liabilities) 391 69
Non-current deferred tax assets (liabilities):    
Net operating loss carryforwards 52,843 51,005
Stock-based compensation 2,154 1,763
Business, foreign and AMT credit carryforwards 1,665 1,730
Capitalized R&D 249 134
Contributions 10 17
Pensions 625 583
Depreciation and amortization 1,060 695
Foreign tax withholding (881) (1,627)
Foreign earnings not permanently reinvested (2,468) (3,209)
Other 18 13
Valuation allowance (55,442) (52,275)
Total non-current deferred tax liabilities $ (167) $ (1,171)