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Note L - Restructuring of Operations and Other Operating Income (Details Textual) $ in Thousands	3 Months Ended			9 Months Ended		58 Months Ended
	Mar. 27, 2020 USD ($)	Dec. 27, 2019 USD ($)	Mar. 29, 2019 USD ($)	Mar. 27, 2020 USD ($)	Mar. 29, 2019 USD ($)	Mar. 27, 2020 USD ($)	Mar. 04, 2020 USD ($)
Restructuring Charges, Total	$ 532		$ 131	$ 4,902	$ 738	$ 12,169
Restructuring and Related Cost, Number of Positions Eliminated						203
Payments for Restructuring				4,531
Gain (Loss) on Disposition of Business					865
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset					492
Buyer of Mill Log [Member]
Financing Receivable, before Allowance for Credit Loss, Total							$ 2,500
Proceeds from Collection of Notes Receivable	500
Buyer of Mill Log [Member] \| Other Current Assets [Member]
Financing Receivable, before Allowance for Credit Loss, Total	2,000			2,000		$ 2,000
Veth Propulsion [Member]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset			(492)
Discontinued Operations, Disposed of by Sale [Member] \| Mill Log Business [Member]
Gain (Loss) on Disposition of Business					865
Employee Severance [Member]
Restructuring Charges, Total	$ 532		$ 131	1,717	$ 738
Contract Termination [Member]
Restructuring Charges, Total				3,185
Contract Termination [Member] \| Manufacturing Segment [Member]
Restructuring Charges, Total				$ 3,185
Restructuring Reserve, Settled without Cash		$ 2,185
Payments for Restructuring		$ 1,000