Note 16 - Income Taxes - Significant Components of Company's Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Net operating loss carry forward, foreign	$ 1,812	$ 1,382
Stock-based compensation expense	1,901	3,148
Foreign currency exchange	346	363
Accrued expenses and other	1,076	818
Inventory reserve	1,187	1,500
Lease liability	5,206
Deferred tax assets	11,528	7,211
Acquisition-related Intangibles	(2,023)	(2,405)
Depreciation	(8,665)	(8,348)
Right of use asset	(5,171)
Deferred tax liabilities	(15,859)	(10,753)
Net deferred tax liabilities	$ (4,331)	$ (3,542)