Note 5 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		6 Months Ended		18 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Mar. 31, 2024
Income (Loss) from Continuing Operations before Income Taxes, Foreign	$ 249,000	$ 296,000	$ 520,000	$ 599,000
Deferred Tax Asset, Valuation Allowance Percent			100.00%
Deferred Tax Assets, Valuation Allowance	4,837,000		$ 4,837,000		$ 4,837,000
Income Tax Expense (Benefit)	0	$ 88,000	3,000	$ 88,000
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability	668,000		668,000		668,000	$ 1,202,000
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability, Current	668,000		668,000		668,000	534,000
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability, Noncurrent	0		$ 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%
Accounting Standards Update 2019-12 [Member]
Income Tax Expense (Benefit)					9,000
Domestic Tax Jurisdiction [Member]
Operating Loss Carryforwards	16,600,000		$ 16,600,000		16,600,000
Open Tax Year			2017 2018 2019 2020 2021 2022 2023 2024
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	$ 16,700,000		$ 16,700,000		$ 16,700,000
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