Note 6 - Stockholders' Equity and Stock-based Compensation - Summary of Performance Option Activity (Details) - Performance Options [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	442,678
Options balances, weighted average exercise price (in dollars per share) | $ / shares	$ 7.71
Options balances, weighted average remaining life (Year)	6 years 3 months 14 days	6 years 9 months 14 days
Options granted, number of shares (in shares) | shares	0
Options granted, weighted average exercise price (in dollars per share) | $ / shares	$ 0
Options exercised, number of shares (in shares) | shares	0
Options exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 0
Options canceled, number of shares (in shares) | shares	0
Options canceled, weighted average exercise price (in dollars per share) | $ / shares	$ 0
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	442,678	442,678
Options balances, weighted average exercise price (in dollars per share) | $ / shares	$ 7.71	$ 7.71
Options exercisable, number of shares (in shares) | shares	437,678
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 7.7
Options exercisable, weighted average remaining life (Year)	6 years 3 months 7 days