Note 3 - Share-based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

Notes Tables

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
	201 7		201 6		201 7		201 6
Restricted share units:
Pretax compensation expense	$	5,977	$	5,390	$	22,987	$	22,298
Tax benefit		2,146		2,048		7,793		8,473
Restricted share unit expense, net of tax	$	3,831	$	3,342	$	15,194	$	13,825
Performance share units:
Pretax compensation expense	$	1,867	$	1,868	$	7,966	$	7,875
Tax benefit		670		710		2,700		2,992
Performance share unit expense, net of tax	$	1,197	$	1,158	$	5,266	$	4,883