Revenues - Revenue from External Customers (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Net sales	$ 11,103,528	$ 7,309,785	$ 21,293,076	$ 15,285,422
Respiratory care products
Net sales	1,838,325	2,061,248	3,986,664	4,217,451
Medical gas equipment
Net sales	4,354,549	3,824,007	8,313,070	7,604,573
Emergency medical products
Net sales	$ 4,910,654	$ 1,424,530	$ 8,993,342	$ 3,463,398