Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Note B - Acquisition of Veth Propulsion Holding BV (Details Textual) - USD ($) $ in Thousands			10 Months Ended	12 Months Ended
	May 13, 2019	Jul. 02, 2018	May 13, 2019	Jun. 30, 2020
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year)				8 years
Veth Propulsion [Member]
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Payments to Acquire Businesses, Gross		$ 58,862	$ 59,407
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 1,991
Stock Issued During Period, Shares, Acquisitions (in shares)	139,347
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred			2,921
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 3,300		$ 3,300
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year)	9 years
Veth Propulsion [Member] \| Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	12 years
Veth Propulsion [Member] \| Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	7 years
Veth Propulsion [Member] \| Trade Names [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	10 years