Note 4 - Income Taxes - Summary of Unrecognized Tax Benefits (Details)	12 Months Ended
	Dec. 31, 2024 USD ($)
Unrecognized tax benefits — January 1, 2024	$ 0
Gross increases — tax positions taken during the prior period	630,000
Gross decreases — tax positions taken during the current period	(449,000)
Unrecognized tax benefits — December 31, 2024	$ 181,000