Note 12 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Deferred Tax Assets, Valuation Allowance, Total	$ 40,857		$ 41,004
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	13,571		12,189
Deferred Tax Assets, Tax Credit Carryforwards, Research	4,530		6,313
Deferred Tax Assets, Operating Loss Carryforwards, Domestic			200,000
Deferred Tax Assets, Operating Loss Carryforwards, Foreign			10,800
Deferred Tax Assets, Operating Loss Carryforwards, State and Local			83,500
Unrecognized Tax Benefits, Ending Balance	12,580	$ 28,673	10,954
Unrecognized Tax Benefits that Would Impact Effective Tax Rate			6,600
Decrease in Unrecognized Tax Benefits is Reasonably Possible			3,000
Reduced in Income Tax Penalties and Interest			1,500
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total			5,300
Business Combination, Indemnification Assets, Amount as of Acquisition Date	9,300		$ 4,200
Tax Cuts and Jobs Act, Income Tax Expense (Benefit), Total		(8,100)
Tax Cuts and Jobs Act, Change in Tax Rate, Income Tax Expense (Benefit), Total		(9,400)
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense	(300)	1,900
Tax Cuts and Jobs Act, Foreign Tax Credit, Income Tax Expense	200	(2,800)
Tax Cuts and Jobs Act, Change in Deferred Tax Assets Valuation Allowance, Income Tax Expense	$ 100	$ (16,600)