Note G - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Federal, State and Local Income Tax Expense (Benefit), Gross, Continuing Operations	$ 2,200	$ 800
Foreign Income Tax Expense (Benefit), Continuing Operations		$ 200
Tax Credit Carryforward, Amount	$ 800
Effective Income Tax Rate Reconciliation, Percent	(23.70%)	29.10%
Dividends and Interest Paid	$ 5,400	$ 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%	21.00%
Fiscal Years After June 30, 2021 [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Domestic Tax Jurisdiction [Member]
Operating Loss Carryforwards	$ 4,600
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	6,600
Foreign Tax Jurisdiction [Member]
Operating Loss Carryforwards	$ 300
Foreign Tax Jurisdiction [Member] | Swiss Federal Tax Administration (FTA) [Member]
Effective Income Tax Rate Reconciliation, Percent	1.00%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent	5.00%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	$ 300	$ 700