Note 13 - Restricted Cash and Deposits	3 Months Ended
Jul. 31, 2022
Notes to Financial Statements
Restricted Assets Disclosure [Text Block]	Note 13 - Restricted Cash and Deposits: Restricted Money Market Investment in the noncurrent assets on the Consolidated Condensed Balance Sheet at July 31, 2022, includes $305,000, which represents cash invested in a bank money market fund securing a letter of credit ("LOC") in the amount of $305,000 issued to the sublandlord as a security deposit for the Company's New York City leased corporate office facility. According to the sublease agreement the LOC and restricted cash were reduced from $469,000 to $305,000 in the third quarter of fiscal year 2022.

Note 13 - Restricted Cash and Deposits

3 Months Ended

Jul. 31, 2022

Restricted Assets Disclosure [Text Block]

Note 13 - Restricted Cash and Deposits:

Restricted Money Market Investment in the noncurrent assets on the Consolidated Condensed Balance Sheet at July 31, 2022, includes $305,000, which represents cash invested in a bank money market fund securing a letter of credit ("LOC") in the amount of $305,000 issued to the sublandlord as a security deposit for the Company's New York City leased corporate office facility. According to the sublease agreement the LOC and restricted cash were reduced from $469,000 to $305,000 in the third quarter of fiscal year 2022.