Inventories (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2022
Inventories
Raw materials	$ 3,436,300	$ 3,703,900	$ 3,298,300
Work-in-process	23,200	66,700	55,300
Finished goods	2,033,400	1,695,000	1,342,700
Inventory	5,492,900	5,465,600	4,696,300
Inventories-Current Assets	4,883,900	4,859,600	4,696,300
Inventories- Noncurrent Assets	$ 609,000	$ 606,000	$ 0