Note 12 - Income Taxes - Components of Net Deferred Tax Assets (Liability) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accrued expenses	$ 2,411	$ 3,042
Stock Compensation	3,129	2,164
Foreign tax credits	12,189	13,571
Net operating loss carryforwards	46,872	43,637
Research and development credits	6,313	4,530
Other	6,391	4,492
Total deferred tax assets	77,305	71,436
Valuation allowance	(41,004)	(40,857)
Deferred tax assets, net of valuation allowance	36,301	30,579
Prepaid expenses and other	(582)	(511)
Intangible assets	(19,719)	(19,552)
Property and equipment, net	(12,871)	(9,415)
Deferred tax liabilities	(33,172)	(29,478)
Net deferred tax assets (liabilities)	$ 3,129	$ 1,101