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Note 9 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 23,300	$ 17,800
Unrecognized Tax Benefits	8,413,000	$ 6,496,000	$ 5,001,000	$ 4,500,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 0
Open Tax Year	2019 2020 2021 2022
Domestic Tax Authority [Member]
Operating Loss Carryforwards	$ 158,700,000
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	21,100,000
Domestic Tax Authority [Member] | Carryforward Subject to Expiration [Member]
Operating Loss Carryforwards	74,100,000
Domestic Tax Authority [Member] | Indefinite Life Carryforwards [Member]
Operating Loss Carryforwards	$ 84,600,000

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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

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