Note 5 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Mar. 31, 2024
Deferred Tax Assets, Valuation Allowance	$ 4,975,000		$ 4,975,000
Income (Loss) from Continuing Operations before Income Taxes, Foreign	218,000	$ 293,000	738,000	$ 892,000
Income Tax Expense (Benefit)	0	$ (14,000)	3,000	$ 74,000
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability	668,000		668,000		$ 1,202,000
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability, Current	668,000		668,000		534,000
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability, Noncurrent	0		$ 0		$ 668,000
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	17.4		$ 17.4
Open Tax Year			2017 2018 2019 2020 2021 2022 2023 2024
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	$ 17.9		$ 17.9
Percentage of Net Operation Loss Carry Forwards, Utilization Limit Against Taxable Income			80.00%
Open Tax Year			2015 2016 2017 2018 2019 2020 2022 2023 2024