Note 5 - Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

Notes Tables

Schedule of Employee Service Share Based Compensation Allocation of Recognized Period Costs, By Award Type [Table Text Block]

	Three Months Ended				Six Months Ended
	June 30,				June 30,
Share-based compensation related to:	2019		2018		2019		2018
Common stock grants	$	100	$	205	$	200	$	305
Stock option grants		24		118		32		134
Restricted Stock Unit Awards ("RSUs")		277		130		464		252
Total share-based compensation	$	401	$	453	$	696	$	691

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

	Shares Under Options			Weighted Average Exercise Price (per share)		Weighted Average Remaining Contractual Life (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2018		134,043		$	20.46
Granted		16,536			38.61
Exercised		(31,058	)		14.18
Outstanding at June 30, 2019		119,521		$	24.61		5.68	$	2,032
Exercisable at June 30, 2019		95,485		$	21.86		5.12	$	1,886
Vested and expected to vest at June 30, 2019		119,521		$	24.61		5.68	$	2,032

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Expected volatility	28.9%
Expected dividends	None
Risk-free interest rate	2.3%
Exercise price	$38.61
Expected term	6.0 years
Weighted-average grant date fair value	$12.70

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

	Restricted Stock Units			Weighted Average Award Date Fair Value
Outstanding at December 31, 2018		72,176		$	23.60
Awarded		67,152			33.50
Shares vested		(19,860	)		23.53
Outstanding at June 30, 2019		119,468		$	27.64