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Note 8 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

						Weighted-Average
						Grant-Date
		Shares				Fair Value
Non-vested at December 31, 2017			497,322			$	22.46
Granted			274,990				28.21
Vested			(238,249	)			23.64
Forfeited			(6,005	)			25.24
Non-vested at March 31, 2018			528,058			$	24.89
Vested but unissued at March 31, 2018			233,449			$	25.15

Phantom Share Units (PSUs) [Member]

Notes Tables

Share-based Compensation, Activity [Table Text Block]

Phantom Stock Plan		Shares				Fair Value
Outstanding at December 31, 2017			89,180			$	27.50
Granted			8,200				27.90
Forfeited			-				-
Distributions			(24	)			27.57
Outstanding at March 31, 2018			97,356			$	26.96
Vested at March 31, 2018			96,509			$	26.96

X

- Definition

Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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