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Note 12 - Leases - Future Minimum Payments (Details) - USD ($)
Apr. 30, 2021
May 01, 2019
2021 * [1] $ 362,000  
2022 1,506,000  
2023 1,597,000  
2024 1,634,000  
2025 1,428,000  
Thereafter 3,837,000  
Total undiscounted future minimum lease payments 10,364,000  
Less: difference between undiscounted lease payments & the present value of future lease payments 1,660,000  
Operating Lease, Liability, Total $ 8,704,000 $ 10,340,000
[1] Excludes the nine months ended January 31, 2021