Note 10 - Stock-based Compensation - Restricted Stock Activity (Details) - Restricted Stock [Member]	6 Months Ended
	Jun. 30, 2022 $ / shares shares
Outstanding, shares (in shares) | shares	1,934,876
Outstanding, grant date fair value (in dollars per share) | $ / shares	$ 8.25
Granted, shares (in shares) | shares	107,301
Granted, grant date fair value (in dollars per share) | $ / shares	$ 7.48
Vested, shares (in shares) | shares	(179,296)
Vested, grant date fair value (in dollars per share) | $ / shares	$ 12.81
Canceled or forfeited, shares (in shares) | shares	(35,641)
Canceled or forfeited, grant date fair value (in dollars per share) | $ / shares	$ 8.99
Outstanding, shares (in shares) | shares	1,827,240
Outstanding, grant date fair value (in dollars per share) | $ / shares	$ 7.74