Note 8 - Stock-based Compensation - Restricted Stock Activity (Details) - Restricted Stock [Member]	6 Months Ended
	Jun. 30, 2025 $ / shares shares
Nonvested (in shares) | shares	1,310,989
Nonvested, weighted average grant-date fair value (in dollars per share) | $ / shares	$ 3.43
Granted (in shares) | shares	1,384,551
Granted, weighted average grant-date fair value (in dollars per share) | $ / shares	$ 1.46
Vested (in shares) | shares	(717,890)
Vested, weighted average grant-date fair value (in dollars per share) | $ / shares	$ 2.86
Forfeited (in shares) | shares	(121,533)
Forfeited, weighted average grant-date fair value (in dollars per share) | $ / shares	$ 3.1
Nonvested (in shares) | shares	1,856,117
Nonvested, weighted average grant-date fair value (in dollars per share) | $ / shares	$ 2.2