Note H - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2017	Mar. 31, 2017
Effective Income Tax Rate Reconciliation, Percent	29.00%	29.90%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		34.00%
Unrecognized Tax Benefits, Period Increase (Decrease)		$ 0
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 0	$ 0
Earliest Tax Year [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Open Tax Year		2013
Earliest Tax Year [Member] | State and Local Jurisdiction [Member]
Open Tax Year		2008