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Note 16 - Income Taxes - Significant Components of Company's Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Net operating loss carry forward, foreign | $ 959 | $ 1,253
Stock-based compensation expense | 2,309 | 1,882
Foreign currency exchange | 265 | 677
Accrued expenses and other | 496 | 308
Inventory reserve | 740 | 640
Deferred tax assets | 4,769 | 4,760
Acquisition-related Intangibles | (2,743) | (2,932)
Depreciation | (7,419) | (8,376)
Deferred tax liabilities | (10,162) | (11,308)
Net deferred tax liabilities | $ (5,393) | $ (6,548)

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