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

12 Months Ended

Dec. 31, 2021

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, 2021		4,080,944		$	22.01
Granted		498,700			49.47
Exercised		(768,668	)		18.43
Forfeited		(6,000	)		37.16
Balance of Outstanding Options at December 31, 2021		3,804,976		$	26.31		6.3	$	111,599,381
Expected to vest after December 31, 2021		2,549,712		$	29.93		7.5	$	65,546,772
Vested and exercisable at December 31, 2021		1,228,362		$	18.54		3.8	$	45,572,873

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, 2021		2,737,757		$	7.95
Granted		498,700			14.77
Vested		(653,843	)		7.60
Forfeited		(6,000	)		11.07
Non-vested at December 31, 2021		2,576,614		$	9.35

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, 2021		987,728						$	24.28
Granted		356,376							44.86
Vested		(499,084	)						25.94
Forfeited		(1,200	)						44.59
Outstanding non-vested at December 31, 2021		843,820			8.4	$	45,540,965		31.97
Expected to vest after December 31, 2021		842,423			8.4	$	45,465,553