Nature of Business and Summary of Significant Accounting Policies - Income Statement location (Details) - USD ($)	3 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Research and development	$ 2,428,000	$ 1,931,000
Net sales	39,493,000	31,051,000
Cost of sales	24,927,000	17,595,000
Selling, General and Administrative Expenses [Member]
Advertising and promotion costs	754,000	1,086,000
Operating Expenses.
Research and development	2,428,000	1,931,000
Cost of sales [Member] | Shipping and Handling
Cost of sales	394,000	333,000
Sales revenue, net | Shipping and Handling
Net sales	$ 112,000	$ 106,000