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Note 12 - Income Taxes - Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred revenue | $ 50 | $ 738
Basis difference in intangible assets | 3,283 | 3,403
Inventory reserve | 2,235 | 2,089
Net operating loss carryforwards | 4,067 | 1,627
Research and development tax credits | 794 | 163
Accrued expenses | 143 | 75
Stock-based compensation | 362 | 327
Allowance for sales returns and doubtful accounts | 160 | 119
Difference in property and equipment basis | (185) | (212)
Other | 551 | 438
Total net deferred income tax asset | 11,460 | 8,767
Less: Valuation allowance | (11,460) | (2,236)
Net deferred income tax asset (liability) |  | $ 6,531

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