Revenue (Details) - USD ($)	12 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Revenues	$ 35,559,160	$ 38,464,821
PMO
Revenues	15,020,542	15,882,189	$ 14,639,687
Speciality Products [Member]
Revenues	1,803,293	1,611,552
Infrared Products
Revenues	$ 18,735,325	$ 20,971,080

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details