Note G - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Federal, State and Local Income Tax Expense (Benefit), Gross, Continuing Operations	$ 821,000	$ 6,000
Operating Loss Carryforwards, Total	$ 3,400,000
Effective Income Tax Rate Reconciliation, Percent, Total	5.40%	17.80%
Undistributed Earnings of Foreign Subsidiaries		$ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Foreign Tax Authority [Member] | Swiss Federal Tax Administration (FTA) [Member]
Effective Income Tax Rate Reconciliation, Percent, Total	18.20%
Domestic Tax Authority [Member]
Open Tax Year	2017 2018 2019 2020