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Note 15 - Restricted Cash and Deposits (Details Textual) - USD ($)
Apr. 30, 2023
Apr. 30, 2022
Jan. 31, 2022
Apr. 30, 2021
Restricted Cash, Total $ 305,000 $ 305,000   $ 469,000
Cash Securing a Letter of Credit Issued as Security Deposit [Member]        
Security Deposit $ 305,000      
Restricted Cash, Total   $ 469,000 $ 305,000