Note 7 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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

	Year Ended December 31,
	2014			2013			2012
Stock-based compensation expense, gross	$	5,012		$	1,974		$	878
Income tax benefit at our statutory rate associated with stock-based compensation		(1,955	)		(770	)		(342	)
Stock-based compensation expense, net	$	3,057		$	1,204		$	536

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

	Year Ended December 31,
	2014					2013					2012
				Weighted-					Weighted-					Weighted-
				Average					Average					Average
	Number			Grant Date		Number			Grant Date		Number			Grant Date
	of			Fair Value		of			Fair Value		of			Fair Value
	Shares			Per Share		Shares			Per Share		Shares			Per Share
Restricted stock - common:
Outstanding - beginning of period		274,838		$	4.43		-		$	-		-		$	-
Granted		312,961			11.78		382,062			5.20		432,396			1.65
Vested		(202,743	)		6.93		(107,224	)		7.16		(432,396	)		1.65
Outstanding - end of period		385,056		$	9.09		274,838		$	4.43		-		$	-

	Year Ended December 31,
	2014					2013				2012
				Weighted-				Weighted-					Weighted-
				Average				Average					Average
	Number			Grant Date		Number		Grant Date		Number			Grant Date
	of			Fair Value		of		Fair Value		of			Fair Value
	Shares			Per Share		Shares		Per Share		Shares			Per Share
Restricted stock - common:
Outstanding - beginning of period		-		$	-		-	$	-		10,000		$	4.94
Granted		236,294			9.80		-		-		-			-
Vested		(31,821	)		9.75		-		-		(10,000	)		4.94
Outstanding - end of period		204,473		$	9.81		-	$	-		-		$	-

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

	Year Ended December 31,
	2014				2013					2012
	Number of Shares Underlying Options		Weighted Average Exercise Price		Number of Shares Underlying Options			Weighted Average Exercise Price		Number of Shares Underlying Options			Weighted Average Exercise Price
Common stock:
Options outstanding - beginning of period		274,746	$	1.99		1,316,068		$	5.98		1,002,350		$	7.50
Options granted		-		-		-			-		359,568			1.99
Options exercised		-		-		(119,822	)		2.34		-			-
Options forfeited		-		-		-			-		(8,700	)		5.32
Options expired		-		-		(921,500	)		7.64		(37,150	)		8.72
Options outstanding - end of period		274,746	$	1.99		274,746		$	1.99		1,316,068		$	5.98
Options exercisable at end of period		137,376	$	1.99		68,688		$	1.99		956,500		$	7.48