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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 |

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- Definition Amount before valuation allowance of current and deferred federal, state and local income tax expense (benefit) attributable to income (loss) from continuing operations. + References No definition available. + Details
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