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Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	21.00%	35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ 73,474
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount		$ 23,824	$ 26,040	$ (42,625)
Open Tax Year		2016 2017 2018 2019
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	$ 0	$ 0	$ 0	$ 0
Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount		70,485
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total		653,524
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total		$ 509,639
Accounting Standards Update 2016-09 [Member]
Deferred Tax Assets, Operating Loss Carryforwards, Total					$ 5,949

X

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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