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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