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Note 4 - Leases (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2024 | Jan. 31, 2024 | Oct. 31, 2019 | Mar. 31, 2025 | Mar. 31, 2024
Operating Lease, Weighted Average Remaining Lease Term (Year) |  |  |  | 19 years 3 months 18 days |
Operating Lease, Weighted Average Discount Rate, Percent |  |  |  | 7.50% |
Heavy-duty Forklift [Member] |  |  |  |  |
Lessee, Finance Lease, Term of Contract (Year) |  |  | 5 years |  |
Finance Lease, Liability, to be Paid |  |  | $ 500,000 |  |
Finance Lease, Monthly Payment |  |  | $ 9,000 |  |
Office Space in Longview, Texas [Member] |  |  |  |  |
Lessee, Operating Lease, Renewal Term (Year) |  | 5 years |  |  |
Operating Lease, Monthly Payments | $ 5,000 | $ 13,000 |  | $ 12,000 |
Operating Lease, Additional Term (Month) |  |  |  |  | 60 months

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- Definition Represents the additional lease term. + References No definition available. + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments for finance lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-6 + Details
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- Definition Term of lessee's 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/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 Weighted average remaining lease term for 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/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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