Stockholders' Equity (Details Narrative) - USD ($)					3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 06, 2017	Jan. 23, 2017	Dec. 01, 2016	Apr. 13, 2016	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016	Jul. 31, 2016
Proceeds from private placement
Proceeds from exercise of warrants							80,000	$ 151,000
Expenses recognized related to services							108,000	$ 163,000
October Closing Date [Member] | Private Placement Financing [Member]
Proceeds from private placement							6,000,000
November Closing Date [Member] | Private Placement Financing [Member]
Proceeds from private placement							$ 2,000,000
Warrant [Member]
Aggregate number of shares								13,906
Number of warrants issued to purchase common stock					106,000	335,981	106,000	335,981
Warrants issued					5,335
Proceeds from exercise of warrants					$ 80,000	$ 151,000
Number of warrants issued					4,179	28,000	4,179	28,000
Private Placement Financing [Member]
Proceeds from private placement		$ 337,000					$ 1,049,000
Aggregate number of shares		396,469
Purchase price per share		$ 0.85
Number of warrants issued to purchase common stock		396,469
Warrant exercise price		$ 1.25
Warrant term		5 years
Private Placement Financing [Member] | Placement Agent Warrant [Member]
Number of warrants issued to purchase common stock					151,294		151,294
Warrant exercise price					$ 1.275		$ 1.275
Aggregate cash fees paid to placement agent							$ 128,600
Due diligence fees paid							12,000
Reimbursement of counsel fees							35,000
Private Placement Financing [Member] | Accredited Investors [Member]
Proceeds from private placement			$ 1,000,000
Aggregate number of shares			1,176,472
Purchase price per share			$ 0.85
Number of warrants issued to purchase common stock			1,176,472
Warrant exercise price			$ 1.25
Warrant term			5 years
Registration Rights Agreement [Member] | Private Placement Financing [Member]
Aggregate number of shares	1,572,941
2015 Private Placement Financing [Member] | October Closing Date [Member]
Proceeds from private placement							6,000,000
2015 Private Placement Financing [Member] | November Closing Date [Member]
Proceeds from private placement							2,000,000
Six Months [Member] | Private Placement Financing [Member]
Warrant term									6 months
Warrants issued									2,820,670
Five Years [Member] | Private Placement Financing [Member]
Warrant term									5 years
Service Agreement [Member]
General financial advisory services				2 years
Number of common shares issued for services				250,000
Value of shares issued for services				$ 290,000
Expenses recognized related to services					$ 36,000	$ 7,000	$ 108,000