Consolidated Statements of Stockholders' Equity (USD $)	Common Stock	Treasury Stock	Additional paid-in capital	Accumulated deficit	Total
Beginning balance at Apr. 30, 2011	$ 1,488,000		$ 16,062,000	$ (10,169,000)	$ 7,381,000
Beginning balance (shares) at Apr. 30, 2011	1,488
Net loss				(3,259,000)	(3,259,000)
Stock based compensation expense			451,000		451,000
Issuance of shares under registered direct offering (shares)	296
Issuance of shares under registered direct offering	296,000		2,702,000		2,998,000
Treasury stock purchased		(45,000)			(45,000)
Ending balance at Apr. 30, 2012	1,748,000	(45,000)	19,215,000	(13,428,000)
Ending balance (shares) at Apr. 30, 2012	1,748
Net loss				(4,625,000)	(4,625,000)
Stock based compensation expense			231,000		231,000
Treasury stock purchased and cancelled (shares)	(129)
Treasury stock purchased and cancelled	(129,000)	45,000	(158,000)		(142,000)
Ending balance at Apr. 30, 2013	1,755,000		19,288,000	(18,053,000)	2,990,000
Ending balance (shares) at Apr. 30, 2013	1,755
Net loss				(2,609,000)	(2,609,000)
Stock based compensation expense			43,000		43,000
Issuance of shares under registered direct offering (shares)	656
Issuance of shares under registered direct offering	656,000		905,000		1,561,000
Ending balance at Apr. 30, 2014	$ 2,411,000		$ 20,236,000	$ (20,662,000)	$ 1,985,000
Ending balance (shares) at Apr. 30, 2014	2,411