Note E - Goodwill and Other Intangibles (Details Textual) $ in Thousands			9 Months Ended	12 Months Ended
		May 13, 2019	Mar. 27, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jul. 02, 2018 USD ($)	Jun. 30, 2018 USD ($)
Goodwill, Ending Balance				$ 0	$ 25,954		$ 2,692
Goodwill, Impairment Loss			$ 25,380	25,380
Impairment of Intangible Assets, Finite-lived				2,223
Goodwill and Intangible Asset Impairment, Total				27,603
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Goodwill and Other Impairment Charge, Amount				$ 1,199
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year)				8 years
Amortization of Intangible Assets, Total				$ 4,532	2,653
Measurement Input, Discount Rate [Member]
Goodwill, Impairment, Weighted Average Discount Rate			0.13
European Propulsion [Member]
Goodwill, Ending Balance					$ 23,371
Goodwill, Impairment Loss				22,822
European Industrial Reporting Unit [Member]
Goodwill, Impairment Loss				$ 2,558
Veth Propulsion [Member]
Goodwill, Ending Balance	[1]					$ 23,999
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	[2]					$ 26,500
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year)		9 years

[1] The Company is not able to deduct any of the goodwill for tax purposes.

[2] Intangibles consist of customer relationships, technology and know-how and tradenames, with estimated useful lives 12 years, 7 years, and 10 years, respectively, and weighted average remaining useful life of approximately 9 years. The amounts acquired are presented in Note E, Goodwill and Other Intangibles.