Note 8 - Equity - Activity Under the Equity Incentive Plans (Details) - $ / shares shares in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Outstanding, beginning balance (in shares)	4,298
Outstanding, beginning balance (in dollars per share)	$ 3.12
Granted (in shares)	247	353	1,855	1,422
Granted (in dollars per share)	$ 2
Exercised/Released (in shares)
Exercised/Released (in dollars per share)
Cancelled (in shares)	(73)
Cancelled (in dollars per share)	$ 3.78
Outstanding, ending balance (in shares)	4,472		4,472
Outstanding, ending balance (in dollars per share)	$ 3.05		$ 3.05
Vested and expected to vest (in shares)			4,022
Vested and expected to vest (in dollars per share)			$ 3.13
Restricted Stock Units (RSUs) [Member]
Outstanding, beginning balance (in shares)	181
Outstanding, beginning balance (in dollars per share)	$ 4.74
Granted (in shares)	69	27	106	165
Granted (in dollars per share)	$ 2
Exercised/Released (in shares)	(75)
Exercised/Released (in dollars per share)	$ 3.11
Cancelled (in shares)
Cancelled (in dollars per share)
Outstanding, ending balance (in shares)	181		175
Outstanding, ending balance (in dollars per share)	$ 4.36		$ 4.36