Note 8 - Share-based Payment Awards - Schedule of Stock Option Activity (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) $ / shares shares
Balance, Options (in shares) | shares	4,839,226
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 4.57
Issued, Options (in shares) | shares	1,441,118
Issued, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 4.42
Exercised, Options (in shares) | shares	(2,500)
Exercised, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 2.97
Forfeited/Cancelled, Options (in shares) | shares	0
Forfeited/Cancelled, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 0
Balance, Options (in shares) | shares	6,277,844
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 4.54
Outstanding, Weighted Average Remaining Contractual Term (Year)	7 years 8 months 12 days
Outstanding, Aggregate Intrinsic Value | $	$ 1,287
Exercisable, Options (in shares) | shares	3,619,469
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 4.74
Exercisable, Weighted Average Remaining Contractual Term (Year)	6 years 7 months 6 days
Exercisable, Aggregate Intrinsic Value | $	$ 1,031
Vested and expected to vest, Options (in shares) | shares	6,277,844
Vested and expected to vest, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 4.54
Vested and expected to vest, Weighted Average Remaining Contractual Term (Year)	7 years 8 months 12 days
Vested and expected to vest at March 31, 2024 | $	$ 1,287