Note 5 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement [Line Items]
Income Tax Expense (Benefit)	$ 0	$ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Income (Loss) from Continuing Operations before Income Taxes, Foreign	$ 772,000	$ 99,000
Deferred Tax Assets, Valuation Allowance	4,754,000	4,360,000
Domestic Tax Authority [Member]
Statement [Line Items]
Operating Loss Carryforwards	$ 15,800,000
Open Tax Year	2017 2018 2019 2020 2021 2022 2023
State and Local Jurisdiction [Member]
Statement [Line Items]
Operating Loss Carryforwards	$ 19,000,000.0
Open Tax Year	2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
Accounting Standards Update 2019-12 [Member]
Statement [Line Items]
Income Tax Expense (Benefit)	$ 7,000	$ 11,000