Note 6 - Stockholders' Equity and Stock-based Compensation - Summary of Performance Option Activity (Details) - Performance Options [Member] - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Options balances, number of shares (in shares)	1,224,130
Options balances, weighted average exercise price (in dollars per share)	$ 5.51
Options balances, weighted average remaining life (Year)	6 years 9 months 14 days	8 years 6 months 10 days
Options granted, number of shares (in shares)	39,000
Options granted, weighted average exercise price (in dollars per share)	$ 8.44
Options exercised, number of shares (in shares)	(9,950)
Options exercised, weighted average exercise price (in dollars per share)	$ 2.92
Options canceled, number of shares (in shares)	(3,000)
Options canceled, weighted average exercise price (in dollars per share)	$ 2.92
Options expired, number of shares (in shares)	(1,000)
Options expired, weighted average exercise price (in dollars per share)	$ 2.92
Options modified from performance-based to time-based and market-based, number of shares (in shares)	(806,502)
Options modified, weighted average exercise price (in dollars per share)	$ 4.49
Options balances, number of shares (in shares)	442,678	1,224,130
Options balances, weighted average exercise price (in dollars per share)	$ 7.71	$ 5.51
Options exercisable, number of shares (in shares)	432,678
Options exercisable, weighted average exercise price (in dollars per share)	$ 7.69
Options exercisable, weighted average remaining life (Year)	6 years 8 months 23 days