Note 3 - Income Taxes (Details Textual) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2022	Dec. 31, 2021
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	$ 0
Open Tax Year	2014 2015 2016 2017 2018 2019 2020 2021
Pre 2018 [Member] \| Domestic Tax Authority [Member] \| Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards		$ 245,200
Post 2017 [Member] \| Domestic Tax Authority [Member] \| Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards		$ 179,000
Earliest Tax Year [Member]
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2022
Latest Tax Year [Member]
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2037

Tax year that remains open to examination under enacted tax laws, in YYYY format.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

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-Publisher FASB
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