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Income Taxes (Details 2) - USD ($) $ in Thousands | Dec. 29, 2017 | Dec. 30, 2016
--- | --- | ---
Deferred tax assets: |  |
Allowance for doubtful accounts and sales returns | $ 230 | $ 244
Inventories | 381 | 662
Accrued vacation | 322 | 437
Accrued other expenses | 559 | 596
Stock-based compensation | 1,444 | 2,154
Pensions | 720 | 625
Depreciation and amortization | 959 | 1,060
Net operating loss carryforwards | 33,770 | 53,232
Business, foreign, AMT and R and D credit carryforwards | 3,706 | 1,665
Prepaid Expenses | 188 | 0
Capitalized R&D | 941 | 920
Other | 92 | 94
Valuation allowance | (40,656) | (57,446)
Total deferred tax assets | 2,656 | 4,243
Deferred tax liabilities: |  |
Foreign tax withholding | (881) | (881)
Amortization of R&D | (723) | (670)
Net Foreign earnings not permanently reinvested | (160) | (2,468)
Total deferred tax liabilities | (1,764) | (4,019)
Total net non-current deferred tax assets | $ 892 | $ 224

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