Note 7 - Stock-based Compensation - Restricted Stock Activity (Details) - Restricted Stock [Member]	3 Months Ended
	Mar. 31, 2024 $ / shares shares	[1]
Nonvested (in shares) | shares	840,815
Nonvested, weighted average grant-date fair value (in dollars per share) | $ / shares	$ 9.73
Granted (in shares) | shares	11,668
Granted, weighted average grant-date fair value (in dollars per share) | $ / shares	$ 3.97
Vested (in shares) | shares	(51,168)
Vested, weighted average grant-date fair value (in dollars per share) | $ / shares	$ 25.58
Forfeited (in shares) | shares	(42,650)
Forfeited, weighted average grant-date fair value (in dollars per share) | $ / shares	$ 11.24
Nonvested (in shares) | shares	758,665
Nonvested, weighted average grant-date fair value (in dollars per share) | $ / shares	$ 8.49

[1] The number of shares and grant date fair value per share have been retroactively restated to reflect the one for twelve (1 for 12) reverse stock split, which was effective on March 22, 2024.