Inventories (Tables)

9 Months Ended

12 Months Ended

Mar. 31, 2021

Jun. 30, 2020

Inventory Disclosure [Abstract]

Inventories

	March 31, 2021		June 30, 2020
Raw materials	$	2,191,200	$	1,726,400
Work-in-process		74,100		35,700
Finished goods		619,900		778,900
	$	2,885,200	$	2,541,000

	2020		2019
Raw materials	$	1,726,400	$	1,597,100
Work-in-process		35,700		77,700
Finished goods		778,900		708,800
	$	2,541,000	$	2,383,600