Note 6 - Stockholders' Equity and Stock-based Compensation - Summary of Stock Option Activity (Details) - The 2015 Plan, 2017 Plan and Inducement Plan [Member]	6 Months Ended	12 Months Ended
	Jun. 30, 2025 $ / shares shares	Dec. 31, 2024 $ / shares shares
Options balances, number of shares (in shares) | shares	10,979,332
Options balances, weighted average exercise price (in dollars per share) | $ / shares	$ 9.59
Options balances, weighted average remaining life (Year)	7 years 2 months 23 days	7 years 1 month 9 days
Options granted, number of shares (in shares) | shares	2,632,900
Options granted, weighted average exercise price (in dollars per share) | $ / shares	$ 18.92
Options exercised, number of shares (in shares) | shares	(54,750)
Options exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 7.16
Options canceled, number of shares (in shares) | shares	(46,000)
Options canceled, weighted average exercise price (in dollars per share) | $ / shares	$ 15.1
Options expired, number of shares (in shares) | shares	0
Options expired, weighted average exercise price (in dollars per share) | $ / shares	$ 0
Options balances, number of shares (in shares) | shares	13,511,482	10,979,332
Options balances, weighted average exercise price (in dollars per share) | $ / shares	$ 11.4	$ 9.59
Options exercisable, number of shares (in shares) | shares	4,988,292
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 12.81
Options exercisable, weighted average remaining life (Year)	4 years 11 months 1 day