Note 7 - Stock-based Awards (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]

Grant Date	Type	Shares		Fair Value Per Share (1)
May 4, 2017	Options	121	$	4.46
May 4, 2017	SUA	13	$	18.87
May 12, 2016	Options	121	$	2.34
May 12, 2016	SUA	17	$	13.82
September 15, 2015	Options	47	$	1.91
September 15, 2015	SUA	1	$	10.21
April 29, 2015	SUA	44	$	16.10

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

	Number of Shares			Weighted Ave. Exercise Price per Share		Aggregate Intrinsic Value (2)
Outstanding, December 31, 2016		160		$	12.76	$	1,907
Granted		121		$	18.87
Exercised		(2	)	$	13.82
Forfeited		-		$	-
Outstanding, December 31, 2017		279		$	15.40	$	1,436
Exercisable, December 31, 2017		56				$	446

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

				Weighted		Weighted
	Number of			Average Price		Average Fair
	Shares			per Share (3)		Value (3)
Outstanding & Unvested, December 31, 2016		74		$	14.62	$	1,077
Granted		13		$	18.87	$	236
Converted to common stock		(10	)	$	13.84	$	(138	)
Cancelled		(15	)	$	16.15	$	(241	)
Forfeited		(29	)	$	14.25	$	(418	)
Outstanding & Unvested, December 31, 2017		33		$	16.08	$	516