Note 7 - Stock-based Compensation - Summary of Stock Option Activity (Details) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Outstanding, balance (in shares)	146,000	95,000	95,000
Balance, grant date weighted-average exercise price (in dollars per share)	$ 2.83	$ 2.76	$ 2.76
Balance, weighted average remaining contractual life (Year)	2 years 6 months 21 days	5 years 6 months 3 days	5 years 5 months 8 days	4 years 9 months 29 days
Balance, aggregate intrinsic value	$ 20,000		$ 0	$ 25,000
Forfeited (in shares)	(84,000)	(19,000)
Forfeited, grant date weighted-average exercise price (in dollars per share)	$ 2.87	$ 2.69
Outstanding, balance (in shares)	62,000	146,000	146,000	95,000
Balance, grant date weighted-average exercise price (in dollars per share)	$ 2.76	$ 2.8	$ 2.83	$ 2.76
Exercisable (in shares)	35,000	38,000
Exercisable, grant date weighted-average exercise price (in dollars per share)	$ 2.76	$ 2.86
Exercisable, weighted average remaining contractual life (Year)		3 years 4 months 6 days
Granted (in shares)		70,000
Granted, grant date weighted-average exercise price (in dollars per share)		$ 2.82
Granted, weighted average remaining contractual life (Year)		7 years
Minimum [Member]
Exercisable, weighted average remaining contractual life (Year)	1 year 3 months 25 days