Revenue (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Jun. 30, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue	$ 4,205,068	$ 6,191,300	$ 18,432,648	$ 19,401,793
ASC 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract liabilities	2,737,963		2,737,963		$ 2,175,235
ASC 606 [Member] | Units Delivered [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue	3,754,628	4,985,926	15,479,212	15,806,805
ASC 606 [Member] | Milestones Achieved [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue	450,440	$ 1,205,374	2,953,436	$ 3,594,988
ASC 606 [Member] | Backlog [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Intangible assets	$ 67,300,000		$ 67,300,000
Percentage of estimated shipments			19.1% in 2021; 50.6% in 2022; 19.1% in 2023, and 11.2% thereafter