Note J - Business Segments and Foreign Operations - Reconciliation of Reportable Segments Other Significant Reconciling Items to Consolidated Totals (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Interest income	$ 55	$ 72	$ 147
Interest expense	282	303	426
Tax benefit	4,773	(3,414)	(12,282)
Depreciation and amortization	6,464	7,017	8,847
Assets	234,713	210,898	213,922
Expenditures for segment assets	6,328	3,133	4,214
Operating Segments [Member]
Interest income	34	74	142
Interest expense	275	301	398
Tax benefit	16,370	2,468	(2,446)
Depreciation and amortization	6,084	6,550	8,007
Assets	312,120	272,554	274,309
Expenditures for segment assets	5,730	2,964	4,038
Segment Reconciling Items [Member]
Interest income	21	(2)	5
Interest expense	7	2	28
Tax benefit	(11,597)	(5,882)	(9,836)
Depreciation and amortization	380	467	840
Assets	(77,407)	(61,656)	(60,387)
Expenditures for segment assets	$ 598	$ 169	$ 176