Note 7 - Share-based Compensation - Restricted Stock Transactions (Details) - Restricted Stock [Member]	6 Months Ended
	Jun. 30, 2023 $ / shares shares
Outstanding (in shares) | shares	372,470
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares	$ 20.45
Granted (in shares) | shares	117,025
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 12.04
Vested (in shares) | shares	(85,863)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 15.81
Forfeited (in shares) | shares	0
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares	$ 0
Outstanding (in shares) | shares	403,632
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares	$ 19.00