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Nature of Business and Summary of Significant Accounting Policies - Income Statement location (Details) - USD ($) | 12 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2020
Research and development | $ 8,024,000 | $ 7,620,000 | $ 7,257,000
Net sales | 143,593,000 | 114,035,000 | 101,359,000
Cost of sales | 84,437,000 | 63,287,000 | 58,515,000
Selling, General and Administrative Expenses [Member] |  |  |
Advertising and promotion costs | 2,889,000 | 1,306,000 | 1,722,000
Operating Expenses. |  |  |
Research and development | 8,024,000 | 7,620,000 | 7,257,000
Cost of sales [Member] | Shipping and Handling |  |  |
Cost of sales | 1,425,000 | 1,058,000 | 1,034,000
Sales revenue, net | Shipping and Handling |  |  |
Net sales | $ 428,000 | $ 395,000 | $ 452,000

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