Note G - Segment Information - Assets and Capital Expenditures by Geographical Region (Details) - USD ($) $ in Thousands	9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2018
Long-Lived Assets	$ 20,882		$ 19,290
Total Assets	98,456		85,207
Capital Expenditures	4,149	$ 2,937
UNITED STATES
Long-Lived Assets	10,978		10,887
Total Assets	57,040		51,562
Capital Expenditures	1,295	966
Europe [Member]
Long-Lived Assets	9,904		8,403
Total Assets	41,416		$ 33,645
Capital Expenditures	$ 2,854	$ 1,971