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Note 1 - General (Details Textual) - USD ($)
Apr. 30, 2020
Nov. 01, 2019
Operating Lease, Liability, Total $ 1,437,610  
Accounting Standards Update 2016-02 [Member]    
Operating Lease, Right-of-Use Asset   $ 138,834
Operating Lease, Liability, Total   $ 139,367