Note 6 - Stock-Based Awards (Details) - Stock Options Activity (USD $)	3 Months Ended	6 Months Ended
	Mar. 31, 2014	Sep. 30, 2014	Sep. 30, 2013
Note 6 - Stock-Based Awards (Details) - Stock Options Activity [Line Items]
Outstanding, Number of Shares (in Shares)	4,377,874	4,305,110
Outstanding, Exercise Price	$ 1.78	$ 1.52
Outstanding, Weighted Average Remaining Contractual Life	6 years	6 years 146 days
Vested and expected to vest at September 30, 2014 (in Shares)		4,262,557
Vested and expected to vest at September 30, 2014		$ 1.53
Vested and expected to vest at September 30, 2014		6 years 146 days
Exercisable at September 30, 2014 (in Shares)		3,260,194
Exercisable at September 30, 2014		$ 1.64
Exercisable at September 30, 2014		5 years 6 months
Granted (in Shares)		830,000
Granted		$ 1.06
Exercised (in Shares)		(25,000)	0
Exercised		$ 0.97
Canceled (in Shares)		(877,764)
Canceled		$ 2.40
Minimum [Member]
Note 6 - Stock-Based Awards (Details) - Stock Options Activity [Line Items]
Outstanding, Exercise Price	$ 0.85	$ 0.85
Vested and expected to vest at September 30, 2014		$ 0.85
Exercisable at September 30, 2014		$ 0.85
Granted		$ 0.90
Exercised		$ 0.97
Canceled		$ 0.95
Maximum [Member]
Note 6 - Stock-Based Awards (Details) - Stock Options Activity [Line Items]
Outstanding, Exercise Price	$ 4.88	$ 4.88
Vested and expected to vest at September 30, 2014		$ 4.88
Exercisable at September 30, 2014		$ 4.88
Granted		$ 1.25
Exercised		$ 0.97
Canceled		$ 4.30