Note 8 - Stock-based Compensation - Stock Option Activity (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) $ / shares shares
Balance, number of options outstanding (in shares) | shares	270,500
Balance, option, weighted average exercise price (in dollars per share) | $ / shares	$ 3.09
Granted, options (in shares) | shares	0
Granted, option, weighted average exercise price (in dollars per share) | $ / shares	$ 0
Exercised, options (in shares) | shares	0
Exercised, option, weighted average exercise price (in dollars per share) | $ / shares	$ 0
Expired or forfeited, options (in shares) | shares	0
Expired or forfeited, option, weighted average exercise price (in dollars per share) | $ / shares	$ 0
Balance, number of options outstanding (in shares) | shares	270,500
Balance, option, weighted average exercise price (in dollars per share) | $ / shares	$ 3.09
Outstanding, weighted average remaining contractual term (Year)	1 year 3 months 21 days
Outstanding, aggregate intrinsic value | $	$ 11
Exercisable, options (in shares) | shares	270,500
Exercisable, option, weighted average exercise price (in dollars per share) | $ / shares	$ 3.09
Exercisable, weighted average remaining contractual term (Year)	1 year 3 months 21 days
Exercisable, aggregate intrinsic value | $	$ 11