Note 5 - Income Taxes - Summary of Operating Loss Carryforwards (Details) $ in Millions	12 Months Ended
	Mar. 31, 2026 USD ($)
Operating Loss Carryforwards, Expiration Year	2,036
Tax Year 2016 [Member]
Operating Loss Carryforwards, Expiration Year	2,036
Tax Year 2017 [Member]
Operating Loss Carryforwards, Expiration Year	2,037
Tax Year 2018 [Member]
Operating Loss Carryforwards, Expiration Year	2,038
Tax Year 2019 [Member]
Operating Loss Carryforwards, Expiration Year	2,039
Tax Year 2020 [Member]
Operating Loss Carryforwards, Expiration Year	2,040
Tax Year 2021 [Member]
Operating Loss Carryforwards, Expiration Year	2,041
Tax Year 2022 [Member]
Operating Loss Carryforwards, Expiration Year	2,042
Tax Year 2024 [Member]
Operating Loss Carryforwards, Expiration Year	2,044
Tax Year 2025 [Member]
Operating Loss Carryforwards, Expiration Year	2,045
Tax Year 2026 [Member]
Operating Loss Carryforwards, Expiration Year	2,046
Income Tax Jurisdiction, Domestic Federal [Member]
Operating Loss Carryforwards	$ 24.4
Income Tax Jurisdiction, Domestic Federal [Member] | Tax Year 2016 [Member]
Operating Loss Carryforwards	0.0
Income Tax Jurisdiction, Domestic Federal [Member] | Tax Year 2017 [Member]
Operating Loss Carryforwards	0.0
Income Tax Jurisdiction, Domestic Federal [Member] | Tax Year 2018 [Member]
Operating Loss Carryforwards	0.0
Income Tax Jurisdiction, Domestic Federal [Member] | Tax Year 2019 [Member]
Operating Loss Carryforwards	1.9
Income Tax Jurisdiction, Domestic Federal [Member] | Tax Year 2020 [Member]
Operating Loss Carryforwards	3.7
Income Tax Jurisdiction, Domestic Federal [Member] | Tax Year 2021 [Member]
Operating Loss Carryforwards	4.0
Income Tax Jurisdiction, Domestic Federal [Member] | Tax Year 2022 [Member]
Operating Loss Carryforwards	3.4
Income Tax Jurisdiction, Domestic Federal [Member] | Tax Year 2024 [Member]
Operating Loss Carryforwards	2.4
Income Tax Jurisdiction, Domestic Federal [Member] | Tax Year 2025 [Member]
Operating Loss Carryforwards	3.7
Income Tax Jurisdiction, Domestic Federal [Member] | Tax Year 2026 [Member]
Operating Loss Carryforwards	5.3
Income Tax Jurisdiction, Domestic State and Local [Member]
Operating Loss Carryforwards	25.5
Income Tax Jurisdiction, Domestic State and Local [Member] | Tax Year 2016 [Member]
Operating Loss Carryforwards	0.6
Income Tax Jurisdiction, Domestic State and Local [Member] | Tax Year 2017 [Member]
Operating Loss Carryforwards	0.8
Income Tax Jurisdiction, Domestic State and Local [Member] | Tax Year 2018 [Member]
Operating Loss Carryforwards	2.6
Income Tax Jurisdiction, Domestic State and Local [Member] | Tax Year 2019 [Member]
Operating Loss Carryforwards	2.7
Income Tax Jurisdiction, Domestic State and Local [Member] | Tax Year 2020 [Member]
Operating Loss Carryforwards	3.0
Income Tax Jurisdiction, Domestic State and Local [Member] | Tax Year 2021 [Member]
Operating Loss Carryforwards	3.2
Income Tax Jurisdiction, Domestic State and Local [Member] | Tax Year 2022 [Member]
Operating Loss Carryforwards	2.9
Income Tax Jurisdiction, Domestic State and Local [Member] | Tax Year 2024 [Member]
Operating Loss Carryforwards	2.1
Income Tax Jurisdiction, Domestic State and Local [Member] | Tax Year 2025 [Member]
Operating Loss Carryforwards	3.2
Income Tax Jurisdiction, Domestic State and Local [Member] | Tax Year 2026 [Member]
Operating Loss Carryforwards	$ 4.4