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

3 Months Ended

Mar. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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

	Three Months Ended
	March 31,
	2015		2014
Cost of revenue	$	103	$	132
Sales and marketing		185		71
Research and development		182		124
General and administrative		491		298
Total stock-based compensation expense	$	961	$	625

Schedule of Equity Awards Granted [Table Text Block]

	Shares
Stock options		70
Restricted stock units		13
Performance stock units		—