Retirement and post retirement plans (Details) - USD ($)	9 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2019
Accrued expenses [Abstract]
Payment for Pension and Other Postretirement Benefits		$ 8,491
Liability, Retirement and Postemployment Benefits			$ 791,985
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate			4.50%
Other Income	$ 758,000
Current portion of post-retirement benefits (related party)	$ 0		$ 101,891

Accrued expenses [Abstract]

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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Amount of revenue and income classified as other.

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Amount of liability, recognized in statement of financial position, for pension, other postretirement and postemployment benefits.

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Amount of cash outflow for pension and other postretirement benefits. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current.

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