Nature of Business and Summary of Significant Accounting Policies - Income Statement location (Details) - USD ($)	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Net sales	$ 44,003,000	$ 41,676,000
Cost of sales	19,387,000	19,263,000
Research and development	3,057,000	2,437,000
Selling, General and Administrative Expenses
Advertising and promotion costs	890,000	761,000
Operating Expenses
Research and development	3,057,000	2,437,000
Cost of sales | Shipping and Handling
Cost of sales	390,000	371,000
Sales revenue, net | Shipping and Handling
Net sales	$ 89,000	$ 83,000