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Summary of Significant Accounting Policies (Details Narrative) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Apr. 30, 2020
Cash and cash equivalents	$ 15,244,000		$ 15,244,000		$ 10,002,000
Revenue remaining performance obligation	800,000		800,000
Performance obligation revenue of next twelve months	$ 700,000		$ 700,000
Revenue remaining performance obligation, percentage			93.00%
Antidilutive securities excluded from computation of earnings per share, shares	5,540,469	5,007,907	5,540,469	5,007,907
Santander Bank [Member] | Letter 2 [Member] | August 2020 [Member]
Letters of credit outstanding, amount	$ 322,734		$ 322,734
Santander Bank [Member] | Letter 2 [Member] | January 2021 [Member]
Letters of credit outstanding, amount	64,547		64,547
Foreign Financial Institutions [Member]
Cash and cash equivalents	300,000		300,000
Restricted Cash and Security Agreements [Member] | Santander Bank [Member] | Letter 1 [Member]
Letters of credit outstanding, amount	125,690		$ 125,690
Line of credit expiration period			May 31, 2021
Restricted Cash and Security Agreements [Member] | Santander Bank [Member] | Letter 2 [Member]
Letters of credit outstanding, amount	$ 645,467		$ 645,467

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