Note 8 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

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, 2016		488,779		$	18.99
Granted		276,900			28.21
Vested		(242,917	)		21.93
Forfeited		(14,680	)		21.77
Non-vested at March 31, 2017		508,082		$	22.53
Vested but unissued at March 31, 2017		270,017		$	22.33

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

	For the three months ended March 31,
(In thousands)	2017		2016
Proceeds from stock options exercised	$	-	$	19
Fair value of shares received upon exercised of stock options		-		328
Tax expense related to stock options exercised		-		(16	)
Intrinsic value of stock options exercised		-		43

Phantom Share Units (PSUs) [Member]

Notes Tables

Share-based Compensation, Activity [Table Text Block]

Phantom Stock Plan	Shares			Fair Value
Outstanding at December 31, 2016		89,339		$	29.39
Granted		6,743			27.17
Forfeited		-			-
Distributions		(198	)		28.93
Outstanding at March 31, 2017		95,884		$	26.87
Vested at March 31, 2017		95,462		$	26.87