Note 11 - Share Based Compensation and Employee Benefit Plans - Non-vested Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Non-vested balance (in shares)	2,737,757
Non-vested, weighted average grant date fair value (in dollars per share)	$ 7.95
Granted (in shares)	498,700
Weighted-average fair value of stock options granted (in dollars per share)	$ 14.77	$ 6.36	$ 8.37
Vested (in shares)	(653,843)
Vested, weighted average grant date fair value (in dollars per share)	$ 7.60
Forfeited (in shares)	(6,000)
Forfeited, weighted average grant date fair value (in dollars per share)	$ 11.07
Non-vested balance (in shares)	2,576,614	2,737,757
Non-vested, weighted average grant date fair value (in dollars per share)	$ 9.35	$ 7.95