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Note 4 - Leases (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2019 | Mar. 31, 2021 | Apr. 30, 2021 | Apr. 01, 2019
Operating Lease, Right-of-Use Asset |  |  |  | $ 63,000
Operating Lease, Monthly Payments |  | $ 4,878 |  |
Finance Lease, Liability, Payment, Due, Total |  | $ 381,121 |  |
Operating Lease, Weighted Average Remaining Lease Term (Year) |  | 36 days |  |
Finance Lease, Weighted Average Remaining Lease Term (Year) |  | 3 years 182 days |  |
Operating Lease, Weighted Average Discount Rate, Percent |  | 7.00% |  |
Finance Lease, Weighted Average Discount Rate, Percent |  | 1.90% |  |
Accrued Expense and Other Noncurrent Liabilities [Member] |  |  |  |
Operating Lease, Liability, Total |  | $ 4,850 |  | $ 63,000
Heavy-duty Forklift [Member] |  |  |  |
Lessee, Finance Lease, Term of Contract (Year) | 5 years |  |  |
Finance Lease, Liability, Payment, Due, Total | $ 518,616 |  |  |
Finance Lease, Monthly Payment | $ 9,074 |  |  |
Subsequent Event [Member] |  |  |  |
Lessee, Operating Lease, Renewal Term (Year) |  |  | 3 years |

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- Definition Amount of lessee's undiscounted obligation for lease payments for finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980 + Details
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- Definition Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + Details
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