Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Increase (Decrease) in Income Taxes	$ (3,400)
Income Tax Expense (Benefit), Total	$ (3,479)	$ (98)
Effective Income Tax Rate Reconciliation, Percent, Total	87.00%	4.00%
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 13,000		$ 13,600
Unrecognized Tax Benefits, Ending Balance	7,400		7,900
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	2,600
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued in Long Term Liabilities	800
Unrecognized Tax Benefits In Deferred Tax Assets	11,200
Unrecognized Tax Benefits In Deferred Tax Asset Subject To Full Valuation Allowance	5,600
Deferred Tax Assets, Valuation Allowance, Total	$ 10,000		$ 10,500