Note I - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Effective Income Tax Rate Reconciliation, Percent, Total	(28.00%)	21.30%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Effective Income Tax Rate Reconciliation, Global Intangible Low-taxed Income, Amount	$ 400
Income Tax Benefit Cares Act	300
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	400
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	500
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 0
Domestic Tax Authority [Member]
Open Tax Year	2017 2018 2019 2020
State and Local Jurisdiction [Member]
Open Tax Year	2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
Foreign Tax Authority [Member] | Swiss Federal Tax Administration (FTA) [Member]
Open Tax Year	2019 2020