Note 16 - Income Taxes - Significant Components of Company's Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Net operating loss carry forward, foreign	$ 1,382	$ 959
Stock-based compensation expense	3,148	2,309
Foreign currency exchange	363	265
Accrued expenses and other	818	496
Inventory reserve	1,500	740
Deferred tax assets	7,211	4,769
Acquisition-related Intangibles	(2,405)	(2,743)
Depreciation	(8,348)	(7,419)
Deferred tax liabilities	(10,753)	(10,162)
Net deferred tax liabilities	$ (3,542)	$ (5,393)