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Note 11 - Leases (Details Textual) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | May 01, 2023 | Dec. 22, 2020 ft²
Lessee, Operating Lease, Term of Contract (Year) |  |  |  |  | 1 year |
Lessee, Operating Lease, Discount Rate | 8.50% |  | 8.50% |  |  |
Leases Under 12 Months [Member] |  |  |  |  |  |
Operating Lease, Expense | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.1 |  |
Leases Over 12 Months [Member] |  |  |  |  |  |
Operating Lease, Expense | $ 0.1 | $ 0.1 | $ 0.2 | $ 0.2 |  |
Addison, Illinois Manufacturing Facility [Member] |  |  |  |  |  |
Area of Real Estate Property (Square Foot) | ft² |  |  |  |  |  | 55,120

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- Definition Discount rate used by lessee to determine present value of operating lease payments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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- Definition Term of lessee's operating 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/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-4 + Details
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