Note 7 - Stockholders' Equity and Stock-based Compensation Expense (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

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

	Three Months Ended
	March 31 ,
	2017		2016
Cost of revenue	$	129	$	141
Sales and marketing		420		376
Research and development		237		180
General and administrative		609		635
Total stock-based compensation expense	$	1,395	$	1,332

Share-based Compensation, Activity [Table Text Block]

				Options Outstanding
	Shares Available for Grant			Number of Stock Options Outstanding			Weighted- Average Exercise Price
Balance, December 31, 2016		721,657			1,116,472		$	9.56
Options granted		(52,000	)		52,000			18.18
Stock awards granted ( 1) (2)		(449,440	)		—			—
Options exercised		—			(201,686	)		8.68
Options canceled		11,352			(11,352	)		17.39
Stock awards canceled ( 1)		94,113			—			—
Balance, March 31 , 2017		325,682			955,434		$	10.12