Note 4 - Stock Option Plans (Tables)

6 Months Ended

Sep. 30, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Outstanding Stock Options			Weighted- Average Exercise Price		Aggregate Intrinsic Value
Balance as of March 31, 2013		4,201,000		$	0.18
Options granted under all plans		3,018,000		$	0.13
Exercised		(88,000	)	$	0.01
Expired and forfeited		(432,000	)	$	0.14
Outstanding at September 30, 2013		6,699,000		$	0.16	$	157,000
Exercisable at September 30, 2013		2,972,000		$	0.23	$	63,000
Vested and expected to vest		4,626,000		$	0.16	$	101,000