Note 11 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 1,900	$ 1,800
Tax Credit Carryforward, Amount	2,387	2,315
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	0	$ 0
Domestic Tax Jurisdiction [Member]
Operating Loss Carryforwards	72,900
Operating Loss Carryforwards Not Subject to Expiration	46,500
Domestic Tax Jurisdiction [Member] | Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	1,600
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	72,200
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	$ 1,000