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Note 15 - Restricted Cash and Deposits | 12 Months Ended
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Apr. 30, 2020
Notes to Financial Statements |
Restricted Assets Disclosure [Text Block] | Note 15 - Restricted Cash and Deposits: Restricted Money Market Investment in the noncurrent assets on the Consolidated Balance Sheets at April 30, 2020 and April 30, 2019, includes $469,000 , which represents cash invested in a bank money market fund securing a letter of credit ("LOC") in the amount of $469,000 issued to the sublandlord as a security deposit for the Company's new leased corporate office facility.

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