Defined Benefit Pension Plan - Additional information (Details) - USD ($)	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020
Defined Benefit Pension Plan
Consecutive period of employee's average month pay received to determine benefits under the Plan	5 years
Number of years of employment to determine pension benefit	10 years
Recognized pension income	$ 128,385	$ 21,174
Estimated amortizations from AOCI into net periodic pension cost during the next fiscal year			$ 408,547