Note 3 - Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	Three Months Ended March 31,
	2021		2020
Restricted share units:
Pretax compensation expense	$	10,778	$	14,679
Tax benefit		2,727		3,758
Restricted share unit expense, net of tax	$	8,051	$	10,921
Performance share units:
Pretax compensation expense	$	4,189	$	3,384
Tax benefit		1,060		866
Performance share unit expense, net of tax	$	3,129	$	2,518