Summary of Significant Accounting Policies - Schedule of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($)	Oct. 31, 2020	Apr. 30, 2020
Restricted Cash	$ 606,000	$ 928,000
Cash and Cash Equivalents	15,244,000	10,002,000
Restricted cash- short term	384,000	707,000
Restricted cash- long term	222,000	221,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	15,850,000	10,930,000
Santander Bank [Member]
Restricted Cash	$ 606,000	$ 928,000

Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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