Note 9 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 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		10,905			19.88
Forfeited		-			-
Distributions		(1,363	)		20.28
Outstanding at June 30, 2016		88,982		$	19.88
Vested at June 30, 2016		88,667		$	19.88

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		(27,945	)		17.08
Forfeited		-			-
Outstanding at June 30, 2016		81,185		$	15.81		1.9	$	330

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		(14,660	)		18.49
Non-vested at June 30, 2016		503,089		$	18.98
Vested but unissued at June 30, 2016		280,450		$	19.28

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

	For the three months ended June 30,				For the six months ended June 30,
(In thousands)	2016		2015		2016			2015
Proceeds from stock options exercised	$	109	$	142	$	127		$	142
Fair value of shares received upon exercise of stock options		22		-		350			20
Tax benefit (expense) related to stock options exercised		14		8		(2	)		9
Intrinsic value of stock options exercised		69		31		112			33