Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Advertising Expense	$ 0	$ 3,550	$ 0
FIFO Inventory Amount	2,149,560	2,408,878
Decreases In Cost Of Goods Sold	0	0	120,965
Inventory Valuation Reserves	$ 2,174,149	1,849,134
Entity Number of Employees	189
Collective Bargaining Period Expiry Date	Jul. 31, 2024
Health Care Insurance Accrued Liabilities	$ 120,000	150,000
Research and Development Expense	571,535	595,236	459,455
Share-based Compensation	14,006	2,415	3,097
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	9,000
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount	6,000	1,000	$ 1,000
Environmental Remediation Expense	1,100,000	1,119,155
Payment of environmental liabilities	60,280	$ 82,155
Total payments for environmental liabilities	$ 142,000
Minimum
Cash discount term	15 days
Property, Plant and Equipment, Useful Life	3 years
Maximum
Cash discount term	30 days
Property, Plant and Equipment, Useful Life	35 years
Collective Bargaining Agreement [Member]
Entity Number of Employees	114