Note 3 - Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

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

	Three Months Ended March 31,
	2020		2019
Restricted share units:
Pretax compensation expense	$	14,679	$	9,741
Tax benefit		3,758		2,435
Restricted share unit expense, net of tax	$	10,921	$	7,306
Performance share units:
Pretax compensation expense	$	3,384	$	3,830
Tax benefit		866		957
Performance share unit expense, net of tax	$	2,518	$	2,873