Note B - Acquisition of Veth Propulsion Holding BV (Details Textual) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended				9 Months Ended
	Jul. 02, 2018	Jan. 31, 2019	Mar. 29, 2019		Mar. 30, 2018	Mar. 29, 2018	Mar. 29, 2019		Mar. 29, 2019		Mar. 30, 2018
Payments to Acquire Businesses, Net of Cash Acquired, Total									$ 60,195
Amortization of Inventory Fair Value Step-up									3,223
Amortization of Intangible Assets, Total			$ 746			$ 46			1,995		135
Veth Propulsion [Member]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Payments to Acquire Businesses, Gross	$ 58,862						$ 58,862	[1]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred		$ 545					545
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	3,700
Payments to Acquire Businesses, Net of Cash Acquired, Total	60,195
Cash Acquired from Acquisition	1,078
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Cash	$ 698
Percentage of Work in Process of Inventory Completed	70.00%
Inventory, Net, Step-up Value Amount	$ 4,375		4,375				4,375		4,375
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total	$ 2,661		2,661	[2]			$ 2,661	[2]	2,661	[2]
Amortization of Inventory Fair Value Step-up			1,050		$ 1,179				3,223		3,537
Amortization of Intangible Assets, Total			749						1,985
Business Combination, Acquisition Related Costs			$ 2						$ 461
Amortization of Intangible Assets and Interest Expense of Long-term Debt, Total, Before Tax					$ 1,136						$ 3,408
Veth Propulsion [Member] | Het Komt Vast Goed B.V. [Member]
Lessee, Operating Lease, Term of Contract	15 years
Lessee, Operating Lease, Annual Rent Payments	$ 1,249
Veth Propulsion [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	2 years
Veth Propulsion [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	13 years

[1] In the statement of cash flows, the cash used in the acquisition of Veth Propulsion in the amount of $60,195 includes the cash used to pay off the loan to the prior parent of Veth Propulsion, and is net of the cash, including restricted cash, acquired in the transaction, of $1,078 (see below for fair value of assets acquired and liabilities assumed).

[2] The fair value of property, plant and equipment is estimated at $2,661. These assets primarily consist of manufacturing equipment, test equipment, vehicles, and office and plant fixtures. Their estimated useful lives range from 2 to 13 years.