CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - 9 months ended Jan. 31, 2017 - USD ($)	Total	Series H Preferred Stock [Member]	Series H-1 Preferred Convertible Stock [Member]	Series H-1 Preferred Stock [Member]	Series H-2 Preferred Stock [Member]	Series H-2 Convertible Preferred Stock [Member]	Preferred Stock [Member]	Preferred Stock [Member] Series H Preferred Stock [Member]	Preferred Stock [Member] Series H-1 Preferred Convertible Stock [Member]	Preferred Stock [Member] Series H-1 Preferred Stock [Member]	Preferred Stock [Member] Series H-2 Preferred Stock [Member]	Preferred Stock [Member] Series H-2 Convertible Preferred Stock [Member]	Common Stock [Member]	Common Stock [Member] Series H Preferred Stock [Member]	Common Stock [Member] Series H-1 Preferred Convertible Stock [Member]	Common Stock [Member] Series H-1 Preferred Stock [Member]	Common Stock [Member] Series H-2 Preferred Stock [Member]	Common Stock [Member] Series H-2 Convertible Preferred Stock [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Series H Preferred Stock [Member]	Additional Paid-in Capital [Member] Series H-1 Preferred Convertible Stock [Member]	Additional Paid-in Capital [Member] Series H-1 Preferred Stock [Member]	Additional Paid-in Capital [Member] Series H-2 Preferred Stock [Member]	Additional Paid-in Capital [Member] Series H-2 Convertible Preferred Stock [Member]	Accumulated Deficit [Member]	Accumulated Deficit [Member] Series H Preferred Stock [Member]	Accumulated Deficit [Member] Series H-1 Preferred Convertible Stock [Member]	Accumulated Deficit [Member] Series H-1 Preferred Stock [Member]	Accumulated Deficit [Member] Series H-2 Preferred Stock [Member]	Accumulated Deficit [Member] Series H-2 Convertible Preferred Stock [Member]
Balance at Apr. 30, 2016	$ 2,225,304						$ 1,105,586						$ 269						$ 85,940,389						$ (84,820,940)
Balance (in shares) at Jan. 31, 2017							7,602						3,352,159
Balance (in shares) at Apr. 30, 2016							10,757						2,691,055
Share based compensation	22,501						$ 0						$ 2						22,499						0
Share based compensation (in shares)							0						15,104
Issuance of Series H-2 preferred stock and warrants for cash					$ 429,631						$ 461,969						$ 0						$ (32,338)						$ 0
Issuance of Series H-2 preferred stock and warrants for cash (in shares)											3,305						0
Issuance of warrants with Series H-2 preferred stock					$ 0						$ (231,248)						$ 0						$ 231,248						$ 0
Beneficial conversion feature of Series H-2 convertible preferred stock						$ 0						$ (183,284)						$ 0						$ 183,284						$ 0
Deemed dividends related to immediate accretion of beneficial conversion feature of Series H-2 convertible preferred stock						$ 0						$ 183,284						$ 0						$ 0						$ (183,284)
Balance at Jan. 31, 2017	2,360,689						$ 669,493						$ 335						87,389,538						(85,698,677)
Conversion of Series preferred stock to common stock		$ 0		$ 0				$ (405,020)		$ (639,500)				$ 26		$ 38				$ 404,994		$ 639,462				$ 0		$ 0
Conversion of Series preferred stock to common stock (in shares)								(2,630)		(3,830)				263,000		383,000
Deemed dividend on conversion of Series H-1 convertible preferred stock to common stock			$ 0						$ 377,706						$ 0						$ 0						$ (377,706)
Net income	$ (316,747)						$ 0						$ 0						$ 0						$ (316,747)