Note 11 - Share Based Compensation and Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Share-based Payment Arrangement, Option, Activity [Table Text Block]

						Weighted
				Weighted		Average
				Average		Remaining		Aggregate
				Exercise		Contractual		Intrinsic
Options	Shares			Price		Life (in Years)		Value
Balance of Outstanding Options at January 1, 2020		4,601,438		$	20.41
Granted		753,600			22.28
Exercised		(1,221,594	)		16.04
Forfeited		(52,500	)		24.63
Balance of Outstanding Options at December 31, 2020		4,080,944		$	22.01		6.4	$	79,205,864
Expected to vest after December 31, 2020		2,705,026		$	24.31		7.7	$	46,284,768
Vested and exercisable at December 31, 2020		1,343,187		$	17.31		3.8	$	32,378,174

Schedule of Nonvested Share Activity [Table Text Block]

				Weighted
				Average
	Number of			Grant Date
Non-vested Shares	Shares			Fair Value
Non-vested at January 1, 2020		2,712,147		$	8.07
Granted		753,600			6.36
Vested		(675,490	)		6.69
Forfeited		(52,500	)		7.91
Non-vested at December 31, 2020		2,737,757		$	7.95

Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

				Weighted
				Average				Weighted
				Remaining		Aggregate		Average
				Contractual		Intrinsic		Grant Date
Stock Awards and Units	Shares			Life (in Years)		Value		Fair Value
Outstanding non-vested shares at January 1, 2020		915,604						$	26.04
Granted		543,528							21.98
Vested		(471,404	)						25.04
Outstanding non-vested at December 31, 2020		987,728			8.6	$	37,425,013	$	24.28
Expected to vest after December 31, 2020		986,332			8.6	$	37,372,147