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Nature of Business and Summary of Significant Accounting Policies - Income Statement location (Details) - USD ($) | 3 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Research and development | $ 2,437,000 | $ 2,428,000
Net sales | 41,676,000 | 39,493,000
Cost of sales | 19,263,000 | 24,927,000
Selling, General and Administrative Expenses |  |
Advertising and promotion costs | 761,000 | 754,000
Operating Expenses |  |
Research and development | 2,437,000 | 2,428,000
Cost of sales | Shipping and Handling |  |
Cost of sales | 371,000 | 394,000
Sales revenue, net | Shipping and Handling |  |
Net sales | $ 83,000 | $ 112,000

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