Note 7 - Share-based Payments (Tables)

6 Months Ended

Jun. 30, 2017

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
Stock Performance Awards Granted to Executive Officers	February 2, 2017		59,500	$	31.00	December 31, 2019
Restricted Stock Units Granted to Executive Officers	February 2, 2017		15,900	$	37.65	25% per year through February 6, 2021
Restricted Stock Units Granted to Key Employees	April 10, 2017		9,995	$	32.78	100% on April 8, 20 21
Restricted Stock Granted to Nonemployee Directors	April 10, 2017		17,600	$	37.75	25% per year through April 8, 20 21

Share-based Compensation, Activity [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands)	201 7		201 6		201 7		201 6
Stock Performance Awards Granted to Executive Officers	$	425	$	304	$	1,074	$	841
Restricted Stock Units Granted to Executive Officers		104		64		368		309
Restricted Stock Granted to Executive Officers		16		22		38		51
Restricted Stock Granted to Nonemployee Directors		144		128		272		235
Restricted Stock Units Granted to Key Employees		81		81		168		145
Employee Stock Purchase Plan (15% discount)		--		44		--		88
Totals	$	770	$	643	$	1,920	$	1,669