Note 5 - Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

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

	Three Months Ended March 31,
Share-based compensation related to:	2018		2017
Common stock grants	$	100	$	100
Stock option grants		15		9
Restricted Stock Unit awards ("RSUs")		122		100
Total share-based compensation	$	237	$	209

Share-based Compensation, Stock Options, 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, 2017		202,379		$	18.23
Granted		-			-
Exercised		(30,452	)		28.94
Outstanding at March 31, 2018		171,927		$	19.32		3.60	$	1,750
Exercisable at March 31, 2018		155,677		$	18.48		3.60	$	1,715
Vested and expected to vest at March 31, 2018		171,927		$	19.32		3.60	$	1,750

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

	Restricted Stock Units			Weighted Average Award Date Fair Value
Outstanding at December 31, 2017		57,395		$	21.03
Awarded		22,399			29.30
Shares vested		(16,050	)		23.55
Outstanding at March 31, 2018		63,744		$	22.11