Note 9 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2019

Notes Tables

Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

	RSU Awards					PRSU Awards
				Weighted-Average					Weighted-Average
				Grant-Date					Grant-Date
	Shares			Fair Value		Shares			Fair Value
Non-vested at December 31, 2018		502,658		$	24.93		-		$	-
Granted		263,574			22.38		66,130			22.38
Vested		(279,187	)		23.39		(30,491	)		22.38
Forfeited		(26,160	)		24.85		-			-
Non-vested at September 30, 2019		460,885		$	24.41		35,639		$	22.38
Vested but unissued at September 30, 2019		229,352		$	24.67		24,691		$	22.38

Phantom Share Units (PSUs) [Member]

Notes Tables

Share-based Payment Arrangement, Activity [Table Text Block]

Phantom Stock Plan	Shares			Fair Value
Outstanding at December 31, 2018		99,313		$	21.53
Granted		10,278			21.97
Distributions		(1,055	)		21.91
Outstanding at September 30, 2019		108,536		$	20.20
Vested at September 30, 2019		108,228		$	20.20