Note F - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Federal, State and Local Income Tax Expense (Benefit), Gross, Continuing Operations		$ 6,000	$ 4,400,000
Operating Loss Carryforwards, Total		$ 3,400,000
Effective Income Tax Rate Reconciliation, Percent, Total		17.80%	52.40%
Income Tax Expense (Benefit), Continuing Operations, Discrete Tax Items Due to Tax Act, Amount, Total		$ 1,300,000	$ 1,700,000
Undistributed Earnings of Foreign Subsidiaries		0
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount		$ 1,100,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	28.06%
Forecast [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, Total		20.00%
Open Tax Year		2015 2016 2017 2018
Domestic Tax Authority [Member]
Open Tax Year		2016 2017 2018
State and Local Jurisdiction [Member]
Open Tax Year		2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018