Note 9 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2016

Phantom Share Units (PSUs) [Member]

Notes Tables

Schedule of Share-based Compensation, Activity [Table Text Block]

Phantom Stock Plan	Shares			Fair Value
Outstanding at December 31, 2015		79,440		$	21.64
Granted		10,150			19.88
Forfeited		-			-
Distributions		(1,362	)		20.28
Outstanding at March 31, 2016		88,228		$	21.62
Vested at March 31, 2016		87,826		$	21.62

Non Full Value Awards [Member]

Notes Tables

Schedule of Share-based Compensation, Activity [Table Text Block]

	Shares			Weighted- Average Exercise Price		Weighted-Average Remaining Contractual Term		Aggregate Intrinsic Value ($000) *
Outstanding at December 31, 2015		109,130		$	16.14
Granted		-			-
Exercised		(18,200	)		19.03
Forfeited		-			-
Outstanding at March 31, 2016		90,930		$	15.56		2.1	$	551

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

	Shares			Weighted-Average Grant-Date Fair Value
Non-vested at December 31, 2015		415,909		$	18.10
Granted		337,175			19.85
Vested		(235,335	)		18.71
Forfeited		(900	)		19.43
Non-vested at March 31, 2016		516,849		$	18.97
Vested but unissued at March 31, 2016		280,450		$	19.28

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

	For the three months ended March 31,
(In thousands)	2016			2015
Proceeds from stock options exercised	$	19		$	-
Fair value of shares received upon exercised of stock options		328			20
Tax (expense) benefit related to stock options exercised		(16	)		1
Intrinsic value of stock options exercised		43			2