Note 10 - Stockholders' Equity (Deficit) (Tables)

9 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Three Months Ended
	December 31, 2017
Risk-free interest rate		2.16	%
Dividend yield		0	%
Expected volatility		56.00	%
Expected term in years		6.08
Weighted average fair value at grant date	$	0.98

	Nine Months Ended
	December 31, 2018			December 31, 2017
Risk-free interest rate		2.75	%		2.01	%
Dividend yield		0	%		0	%
Expected volatility		61.35	%		55.00	%
Expected term in years		5.50			6.08
Weighted average fair value at grant date	$	0.57		$	1.47

Share-based Compensation, Activity [Table Text Block]

	Options Outstanding					Restricted Stock Units Outstanding
	Number of shares (in thousands)			Weighted average exercise price		Number of shares (in thousands)			Weighted average fair value
Outstanding at October 1, 2018		4,407		$	2.64		315		$	1.87
Exercised/Released		-		$	-		(192	)	$	1.88
Cancelled		(306	)	$	2.25		-		$	-
Outstanding at December 31, 2018		4,101		$	2.61		123		$	1.85
Vested and expected to vest		4,024		$	2.62

Schedule of Share-based Compensation, Shares Available for Grant [Table Text Block]

	Shares Available for Grant
	(in thousands)
Balance at October 1, 2018		232
Options:
Cancelled		255
Shares added to the plans		50
Balance at December 31, 2018		537

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

			Options Outstanding				Options Vested
Range of Exercise Prices per share			Number of Shares (in thousands)		Weighted- Average Remaining Contractual Life (in years)		Number of Shares (in thousands)		Weighted-Average Exercise Price per Share
$0.78	—	$1.53		324		8.37		114	$	1.28
$1.64	—	$1.64		1,892		7.09		1,330	$	1.64
$1.75	—	$1.81		484		8.16		252	$	1.79
$2.00	—	$3.99		374		7.04		275	$	3.27
$4.32	—	$4.32		627		6.58		535	$	4.32
$5.18	—	$5.99		123		4.59		124	$	5.68
$6.14	—	$6.14		213		6.45		187	$	6.14
$6.30	—	$6.30		23		4.87		23	$	6.30
$6.61	—	$6.61		36		2.56		36	$	6.61
$7.20	—	$7.20		5		0.16		5	$	7.20
$0.78	—	$7.20		4,101		7.10		2,881	$	2.87

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

	Three Months Ended				Nine Months Ended
	Dec ember 3 1 , 2018		December 31 , 2017		December 31 , 2018		December 31 , 2017
Cost of revenues	$	15	$	23	$	73	$	144
Research and development		58		61		193		225
Sales and marketing		58		78		244		309
General and administrative		284		281		905		971
Impact on net loss	$	415	$	443	$	1,415	$	1,649