Note 6 - Share-based Payments (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

Award	Grant Date	Shares/ Units Granted		Weighted Average Grant-Date Fair Value per Award		Vesting
Restricted Stock Units Granted:
With Dividend Equivalent:
To Key Management Employees	February 3, 2020		3,000	$	54.0450	25% per year through February 6, 2024
To Executive Officers	February 12, 2020		15,300	$	54.0607	25% per year through February 6, 2024
Without Dividend Equivalent:
To Nonexecutive Employees	April 20, 2020		14,975	$	40.18	100% April 8, 2024
Stock Performance Awards Granted:
Under Executive Agreement	February 12, 2020		47,600	$	47.10	December 31, 2022
Under Legacy Agreement	February 12, 2020		7,400	$	52.20	December 31, 2022
Restricted Stock Granted to Nonemployee Directors	April 20, 2020		17,400	$	44.85	33% per year through April 8, 2023

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

	Three months ended				Six months ended
	June 30,				June 30,
(in thousands)	2020		2019		2020		2019
Stock Performance Awards Granted to Executive Officers	$	712	$	1,418	$	2,412	$	2,531
Restricted Stock Dividend Equivalent Units Granted to Executive Officers and Key Employees		106		383		785		810
Restricted Stock Granted to Nonemployee Directors		236		204		440		369
Restricted Stock Units Granted to Nonexecutive Employees		141		143		275		234
ESPP (15% discount)		42		-		95		-
Totals	$	1,237	$	2,148	$	4,007	$	3,944