Retirement and post retirement plans (Details) - USD ($)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Accrued expenses [Abstract]
Multiemployer Plans, Plan Contributions		$ 0
Payment for Pension and Other Postretirement Benefits		8,491
Liability, Retirement and Postemployment Benefits	$ 791,985	851,371	$ 901,238
Pension and post-retirement benifits obligation actuarial adjustments	42,505	52,024
Deferred Compensation Arrangement with Individual, Distribution Paid	$ (101,891)	$ (101,891)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		4.50%