Commitments and Contingencies (Details Textual) - USD ($)	12 Months Ended
Jun. 28, 2020	Jun. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Cost incurred inception to date on installation and on-going monitoring of wells	$ 616,000
Environmental	$ 1,259,000	$ 1,278,000

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

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