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

6 Months Ended

Jun. 30, 2016

Notes Tables

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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2016		2015		2016		2015
Cost of revenue	$	40	$	114	$	181	$	217
Sales and marketing		229		231		605		416
Research and development		105		180		285		362
General and administrative		376		457		1,011		948
Total stock-based compensation expense	$	750	$	982	$	2,082	$	1,943

Schedule of 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, 2015		1,263,425			2,148,797		$	9.31
Options granted		(93,000	)		93,000			11.54
Stock awards granted ( 1) (2)		(925,675	)		—			—
Options exercised		—			(292,934	)		8.70
Options canceled		107,620			(107,620	)		13.37
Stock awards canceled ( 1)		206,541			—			—
Balance, June 30, 2016		558,911			1,841,243		$	9.28