Note H - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Effective Income Tax Rate Reconciliation, Percent, Total	20.60%	28.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 0
Earliest Tax Year [Member] \| Domestic Tax Authority [Member]
Open Tax Year	2015
Earliest Tax Year [Member] \| State and Local Jurisdiction [Member]
Open Tax Year	2007
Earliest Tax Year [Member] \| Foreign Tax Authority [Member] \| Swiss Federal Tax Administration (FTA) [Member]
Open Tax Year	2015

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Tax year that remains open to examination under enacted tax laws, in CCYY format.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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