Note N - Income Taxes - Reconciliation of U.S. Federal Income Taxes to Actual Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
U.S. federal income tax at 21%	$ (2,066)	$ (9,185)
Increases (reductions) in tax resulting from:
Foreign tax items	552	236
State taxes	(440)	(716)
Change in prior year estimate	(1,138)	(213)
Nondeductible PPP loan expenses	(1,722)	0
Research and development tax credits	(336)	(412)
Goodwill impairment	0	4,814
Unrecognized tax benefits	59	9
Stock compensation	252	(93)
Rate changes	18	237
Deferred tax basis adjustments	42	(138)
GILTI inclusion	0	1,220
Valuation allowance	24,420	0
Other, net	39	72
Income tax (benefit) expense	$ 19,680	$ (4,169)