Note 5 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2025
Deferred Tax Assets, Valuation Allowance	$ 6,739,000		$ 6,739,000
Income (Loss) from Continuing Operations before Income Taxes, Foreign	165,000	$ 249,000	344,000	$ 520,000
Income Tax Expense (Benefit)	0	$ 0	0	$ 3,000
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability	0		0		$ 668,000
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability, Current	0		0		668,000
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability, Noncurrent	0		$ 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	21,400,000		$ 21,400,000
Open Tax Year			2018 2019 2020 2021 2022 2023 2024 2025
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	23,200,000		$ 23,200,000
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			2016 2017 2018 2019 2020 2022 2023 2024 2025