Note 12 - Net Loss Per Share Available to Common Stockholders (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended March 31,
	2019			2018
Numerator:
Net loss available to common stockholders	$	(4,606	)	$	(9,112	)
Denominator:
Weighted average number of shares, basic and diluted		5,945			5,736
Net loss per share available to common stockholders
Basic and diluted net loss per common share available to common stockholders	$	(0.77	)	$	(1.59	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	Three Months Ended March 31,
	2019		2018
Options to purchase common stock		430		502
Unvested RSUs		854		531
Total		1,284		1,033