Note 6 - Stockholders' Equity - Summary of Option Activity (Details) - Share-Based Payment Arrangement, Option [Member] - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Share-Based Payment Arrangement, Employee [Member]
Number of options (in shares)	3,036,989
Weighted average exercise price, outstanding (in dollars per share)	$ 2.29
Weighted average remaining contractual life, outstanding (Year)	4 years 7 months 28 days	5 years 4 months 28 days
Aggregate intrinsic value, outstanding	$ 0
Number of options granted (in shares)	0
Weighted average exercise price, granted (in dollars per share)	$ 0
Number of options exercised (in shares)	0
Weighted average exercise price, exercised (in dollars per share)	$ 0
Number of options forfeited and expired (in shares)	0
Weighted average exercise price, forfeited or expired (in dollars per share)	$ 0
Number of options (in shares)	3,036,989	3,036,989
Weighted average exercise price, outstanding (in dollars per share)	$ 2.32	$ 2.29
Number of options exercisable (in shares)	2,188,433
Weighted average exercise price, exercisable (in dollars per share)	$ 2.29
Weighted average remaining contractual life, exercisable (Year)	4 years 21 days
Number of options, exercised (in shares)	0
Number of options, forfeited or expired (in shares)	0
Share-Based Payment Arrangement, Nonemployee [Member]
Number of options (in shares)	91,663
Weighted average exercise price, outstanding (in dollars per share)	$ 1.76
Weighted average remaining contractual life, outstanding (Year)	2 years 4 months 13 days	2 years 3 months
Aggregate intrinsic value, outstanding	$ 4,083	$ 2,833
Number of options granted (in shares)	24,999
Weighted average exercise price, granted (in dollars per share)	$ 0.84
Number of options exercised (in shares)	(0)
Weighted average exercise price, exercised (in dollars per share)	$ 0
Number of options forfeited and expired (in shares)	16,666
Weighted average exercise price, forfeited or expired (in dollars per share)	$ 0.55
Number of options (in shares)	99,996	91,663
Weighted average exercise price, outstanding (in dollars per share)	$ 1.74	$ 1.76
Number of options exercisable (in shares)	77,772
Weighted average exercise price, exercisable (in dollars per share)	$ 1.99
Weighted average remaining contractual life, exercisable (Year)	1 year 9 months 21 days
Weighted average remaining contractual life, granted (Year)	4 years 8 months 15 days
Number of options, exercised (in shares)	0
Number of options, forfeited or expired (in shares)	(16,666)
Aggregate intrinsic value, exercisable	$ 1,916