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Note 4 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Deferred Tax Assets, Valuation Allowance, Total			$ 117,300
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total		$ 0
Open Tax Year		2015 2016 2017 2018 2019 2020
Pre 2018 [Member] \| Domestic Tax Authority [Member] \| Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Total			245,200
Post 2018 [Member] \| Domestic Tax Authority [Member] \| Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Total			$ 140,000
Earliest Tax Year [Member]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2022
Latest Tax Year [Member]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2037