Note 11 - Share Based Compensation and Employee Benefit Plans - Non-vested Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Non-vested balance (in shares)	1,796,356
Non-vested, weighted average grant date fair value (in dollars per share)	$ 11.74
Granted (in shares)	482,663
Weighted-average fair value of stock options granted (in dollars per share)	$ 12.56	$ 15.46	$ 12.33
Vested (in shares)	(447,531)
Vested, weighted average grant date fair value (in dollars per share)	$ 11.12
Forfeited (in shares)	(23,333)
Forfeited, weighted average grant date fair value (in dollars per share)	$ 11.92
Non-vested balance (in shares)	1,808,155	1,796,356
Non-vested, weighted average grant date fair value (in dollars per share)	$ 12.11	$ 11.74