v3.25.1

Note 9 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Income Tax Expense (Benefit)	$ 0	$ 0
Deferred Tax Assets, Valuation Allowance	34,981	35,672
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	0	$ 0
Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	3,000
Domestic Tax Jurisdiction [Member]
Operating Loss Carryforwards	89,400
Domestic Tax Jurisdiction [Member] \| Indefinite Carryforward [Member]
Operating Loss Carryforwards	74,900
Domestic Tax Jurisdiction [Member] \| Expires 2034 [Member]
Operating Loss Carryforwards	14,500
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	141,000
State and Local Jurisdiction [Member] \| Indefinite Carryforward [Member]
Operating Loss Carryforwards	0
State and Local Jurisdiction [Member] \| Expires 2034 [Member]
Operating Loss Carryforwards	$ 141,000

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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