Note 7 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

Notes Tables

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Stock-based compensation expense, gross	$	1,742		$	1,434		$	3,899		$	2,772
Forfeitures		(528	)		-			(528	)		-
Income tax benefit at our statutory rate associated with stock-based compensation		(308	)		(559	)		(856	)		(1,081	)
Stock-based compensation expense, net	$	906		$	875		$	2,515		$	1,691

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

	Six Months Ended
	June 30, 2018					June 30, 2017
				Weighted-					Weighted-
				average					average
				Grant Date					Grant Date
	Number of			Fair Value		Number of			Fair Value
	Shares			Per Share		Shares			Per Share
Restricted stock - common:
Outstanding - beginning of period		503,685		$	11.14		396,033		$	12.06
Granted		391,836		$	14.63		307,943		$	10.40
Vested		(225,570	)	$	11.21		(200,291	)	$	11.82
Forfeited		(91,057	)	$	13.27		-		$	-
Outstanding - end of period		578,894		$	13.14		503,685		$	11.14
Restricted stock - Class A common:
Outstanding - beginning of period		462,632		$	10.63		415,082		$	10.15
Granted (1)		220,080		$	12.65		275,076		$	10.84
Vested		(274,926	)	$	10.48		(227,526	)	$	10.00
Restricted stock - end of period		407,786		$	11.82		462,632		$	10.63
Restricted stock units - common stock:
Outstanding - beginning of period		209,500		$	15.70
Vested		(209,500	)	$	15.70
Outstanding - end of period		-		$	-