Note 5 - Income Taxes (Details Textual) - USD ($)	3 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Mar. 31, 2025
Deferred Tax Assets, Valuation Allowance	$ 6,452,000
Income (Loss) from Continuing Operations before Income Taxes, Foreign	178,000	$ 272,000
Income Tax Expense (Benefit)	0	3,000
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability	668,000		$ 668,000
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability, Current	668,000		668,000
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability, Noncurrent	$ 0		$ 0
Federal Tax Liability Payable, Duration (Year)	8 years
Percentage of Federal Tax Liability Payable in First Five Installments	8.00%
Percentage of Federal Tax Liability Payable in Sixth Installment	15.00%
Percentage of Federal Tax Liability Payable in Seventh Installment	20.00%
Percentage of Federal Tax Liability Payable in Final Installment	25.00%
Domestic Tax Jurisdiction [Member]
Operating Loss Carryforwards	$ 20,200,000
Open Tax Year	2017 2018 2019 2020 2021 2022 2023 2024
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	$ 22,100,000
Percentage of Net Operation Loss Carry Forwards, Utilization Limit Against Taxable Income	80.00%
Income Tax Expense (Benefit)	$ 9,000	$ 9,000
Open Tax Year	2015 2016 2017 2018 2019 2020 2022 2023 2024