Note F - Goodwill and Other Intangibles - Goodwill Rollforward (Details) - USD ($)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Balance, goodwill gross carrying amount	$ 39,776,000	$ 16,514,000	$ 16,407,000
Translation adjustment, goodwill gross carrying amount	(737,000)	107,000
Acquisition, goodwill gross carrying amount	23,999,000
Balance, goodwill accumulated impairment	(13,822)	(13,822,000)	(13,822,000)
Goodwill, Ending Balance	25,954,000	2,692,000	2,585,000
European Industrial [Member]
Translation adjustment, goodwill gross carrying amount	(109,000)	107,000
Acquisition, goodwill gross carrying amount
Goodwill, Ending Balance	2,583,000	2,692,000	2,585,000
European Propulsion [Member]
Translation adjustment, goodwill gross carrying amount	(628,000)
Acquisition, goodwill gross carrying amount	23,999,000
Goodwill, Ending Balance	$ 23,371,000