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Note 12 - Income Taxes - Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred revenue | $ 738 | $ 845
Basis difference in intangible assets | 3,403 | (56)
Inventory reserve | 2,089 | 2,650
Net operating loss carryforwards | 1,627 | 1,391
Research and development tax credits | 163 | 88
Accrued expenses | 75 | 92
Stock-based compensation | 327 | 584
Allowance for sales returns and doubtful accounts | 119 | 70
Difference in property and equipment basis | (212) | (350)
Other | 438 | 743
Total net deferred income tax asset | 8,767 | 6,057
Less: Valuation allowance | (2,236) | (1,403)
Net deferred income tax asset (liability) | $ 6,531 | $ 4,654

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