Note 11 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

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, 2015		415,909		$	18.10
Granted		337,175			19.85
Vested		(238,995	)		18.70
Forfeited		(25,310	)		18.71
Non-vested at December 31, 2016		488,779		$	18.99
Vested but unissued at December 31, 2016		283,910		$	19.27

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

(In thousands)	2016		2015		2014
Proceeds from stock options exercised	$	328	$	145	$	565
Fair value of shares received upon exercise of stock options		1,380		447		1,962
Tax benefit related to stock options exercised		185		99		88
Intrinsic value of stock options exercised		841		330		488
Weighted average fair value on grant date		n/a		n/a		n/a

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		12,056			20.49
Forfeited		-			-
Distributions		(2,157	)		20.76
Outstanding at December 31, 2016		89,339		$	29.39
Vested at December 31, 2016		89,164		$	29.39

Non Full Value Awards [Member]

Notes Tables

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

				Weighted-		Weighted-Average		Aggregate
				Average		Remaining		Intrinsic
				Exercise		Contractual		Value
	Shares			Price		(years)		($000)*
Outstanding at December 31, 2015		109,130		$	16.14
Granted		-			-
Exercised		(103,530	)		16.49
Forfeited		-			-
Outstanding at December 31, 2016		5,600		$	9.61		2.0	$	111
Exercisable shares at December 31, 2016		5,600		$	9.61		2.0	$	111