Note G - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Federal, State and Local Income Tax Expense (Benefit), Gross, Continuing Operations	$ 800	$ 2,000
Foreign Income Tax Expense (Benefit), Continuing Operations	200	$ 900
Operating Loss Carryforwards	$ 5,600
Effective Income Tax Rate Reconciliation, Percent	29.10%	21.60%
Dividends and Interest Paid	$ 14,700
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Fiscal Years After June 30, 2021 [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Foreign Tax Authority [Member] | Swiss Federal Tax Administration (FTA) [Member]
Effective Income Tax Rate Reconciliation, Percent	23.00%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent	5.00%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	$ 700