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Note 5 - Income Taxes - Summary of Operating Loss Carryforwards (Details) $ in Millions | 12 Months Ended
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Mar. 31, 2024 USD ($) item yr
Operating Loss Carryforwards, Expiration Year (Year) | yr | 2,034
Tax Year 2014 [Member] |
Operating Loss Carryforwards, Expiration Year (Year) | item | 2,034
Tax Year 2016 [Member] |
Operating Loss Carryforwards, Expiration Year (Year) | item | 2,036
Tax Year 2017 [Member] |
Operating Loss Carryforwards, Expiration Year (Year) | item | 2,037
Tax Year 2018 [Member] |
Operating Loss Carryforwards, Expiration Year (Year) | item | 2,038
Tax Year 2019 [Member] |
Operating Loss Carryforwards, Expiration Year (Year) | item | 2,039
Tax Year 2020 [Member] |
Operating Loss Carryforwards, Expiration Year (Year) | item | 2,040
Tax Year 2021 [Member] |
Operating Loss Carryforwards, Expiration Year (Year) | item | 2,041
Tax Year 2022 [Member] |
Operating Loss Carryforwards, Expiration Year (Year) | item | 2,042
Tax Year 2023 [Member] |
Operating Loss Carryforwards, Expiration Year (Year) | item | 2,043
Tax Year 2024 [Member] |
Operating Loss Carryforwards, Expiration Year (Year) | item | 2,044
Domestic Tax Jurisdiction [Member] |
Operating loss carryforward | $ 14.8
Domestic Tax Jurisdiction [Member] | Tax Year 2014 [Member] |
Operating loss carryforward | 0.0
Domestic Tax Jurisdiction [Member] | Tax Year 2016 [Member] |
Operating loss carryforward | 0.0
Domestic Tax Jurisdiction [Member] | Tax Year 2017 [Member] |
Operating loss carryforward | 0.0
Domestic Tax Jurisdiction [Member] | Tax Year 2018 [Member] |
Operating loss carryforward | 0.0
Domestic Tax Jurisdiction [Member] | Tax Year 2019 [Member] |
Operating loss carryforward | 3.3
Domestic Tax Jurisdiction [Member] | Tax Year 2020 [Member] |
Operating loss carryforward | 3.6
Domestic Tax Jurisdiction [Member] | Tax Year 2021 [Member] |
Operating loss carryforward | 4.0
Domestic Tax Jurisdiction [Member] | Tax Year 2022 [Member] |
Operating loss carryforward | 3.4
Domestic Tax Jurisdiction [Member] | Tax Year 2023 [Member] |
Operating loss carryforward | (1.4)
Domestic Tax Jurisdiction [Member] | Tax Year 2024 [Member] |
Operating loss carryforward | 1.9
State and Local Jurisdiction [Member] |
Operating loss carryforward | 14.9
State and Local Jurisdiction [Member] | Tax Year 2014 [Member] |
Operating loss carryforward | 0.2
State and Local Jurisdiction [Member] | Tax Year 2016 [Member] |
Operating loss carryforward | 1.5
State and Local Jurisdiction [Member] | Tax Year 2017 [Member] |
Operating loss carryforward | 0.8
State and Local Jurisdiction [Member] | Tax Year 2018 [Member] |
Operating loss carryforward | 2.7
State and Local Jurisdiction [Member] | Tax Year 2019 [Member] |
Operating loss carryforward | 2.8
State and Local Jurisdiction [Member] | Tax Year 2020 [Member] |
Operating loss carryforward | 3.1
State and Local Jurisdiction [Member] | Tax Year 2021 [Member] |
Operating loss carryforward | 1.9
State and Local Jurisdiction [Member] | Tax Year 2022 [Member] |
Operating loss carryforward | 1.9
State and Local Jurisdiction [Member] | Tax Year 2023 [Member] |
Operating loss carryforward | (1.6)
State and Local Jurisdiction [Member] | Tax Year 2024 [Member] |
Operating loss carryforward | $ 1.6

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-3 + Details
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