Revenues - Revenue from External Customers (Details) - USD ($)	3 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Net sales	$ 7,357,593	$ 10,189,548
Respiratory care products
Net sales	1,883,711	2,148,339
Medical gas equipment
Net sales	3,708,538	3,958,521
Emergency medical products
Net sales	$ 1,765,344	$ 4,082,688

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