Note 4 - Stock Option Plans (Details) - Stock Option Plan Activity (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012
Stock Option Plan Activity [Abstract]
Balance as of March 31, 2013		4,201,000
Balance as of March 31, 2013 (in Dollars per share)		$ 0.18
Options granted under all plans	3,018,347	3,018,000	1,457,000
Options granted under all plans (in Dollars per share)		$ 0.13
Exercised		(88,000)
Exercised (in Dollars per share)		$ 0.01
Expired and forfeited		(432,000)
Expired and forfeited (in Dollars per share)		$ 0.14
Outstanding at September 30, 2013	6,699,000	6,699,000
Outstanding at September 30, 2013 (in Dollars per share)	$ 0.16	$ 0.16
Outstanding at September 30, 2013 (in Dollars)	$ 157,000	$ 157,000
Exercisable at September 30, 2013	2,972,000	2,972,000
Exercisable at September 30, 2013 (in Dollars per share)	$ 0.23	$ 0.23
Exercisable at September 30, 2013 (in Dollars)	63,000	63,000
Vested and expected to vest	4,626,000	4,626,000
Vested and expected to vest (in Dollars per share)	$ 0.16	$ 0.16
Vested and expected to vest (in Dollars)	$ 101,000	$ 101,000