Note F - Goodwill and Other Intangibles (Details Textual)			12 Months Ended
		May 13, 2019	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jul. 02, 2018 USD ($)	Jun. 30, 2017 USD ($)
Goodwill, Ending Balance			$ 25,954,000	$ 2,692,000		$ 2,585,000
Goodwill, Impairment Loss			$ 0
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			9 years
Amortization of Intangible Assets, Total			$ 2,653,000	149,000
Indefinite-lived Intangible Assets (Excluding Goodwill), Ending Balance			200,000	202,000
European Propulsion [Member]
Goodwill, Ending Balance			23,371,000
Goodwill, Impairment Loss			$ 0
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount			118.00%
European Industrial [Member]
Goodwill, Ending Balance			$ 2,583,000	$ 2,692,000		$ 2,585,000
Goodwill, Impairment Loss			$ 0
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount			41.00%
Measurement Input, Discount Rate [Member] | European Propulsion [Member]
Goodwill, Measurement Input			0.13
Measurement Input, Discount Rate [Member] | European Industrial [Member]
Goodwill, Measurement Input			0.14
Veth Propulsion [Member]
Goodwill, Ending Balance	[1]				$ 23,999,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	[2]				$ 26,500,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		9 years
Amortization of Intangible Assets, Total			$ 2,636,000

[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 F, Goodwill and Other Intangibles.