7. EQUITY COMPENSATION PLANS (Details Narrative)	9 Months Ended
Jan. 31, 2018 USD ($) $ / shares shares
Stock Incentive Plans [Member]
Shares available for grant	5,433,646
Stock Options [Member]
Shares available for grant	3,989,356
Future grants of share-based awards [Member]
Shares available for grant	1,444,290
ESPP [Member]
Shares authorized under plan	2,142,857
Shares available for grant	1,303,770
Common stock purchased under plan	55,966
Purchase price per share \| $ / shares	$ 3.87
Non-Vested Employee Stock Options [Member]
Unrecognized compensation cost \| $	$ 2,605,000
Unrecognized cost amortization period	2 years 8 months 1 day

Unrecognized cost of unvested share-based compensation awards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of shares of capital stock issued (purchased by employees) in connection with an employee stock ownership plan.

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