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Note 1 - Summary of Significant Accounting Policies - Components of Inventory (Details) - USD ($) | Sep. 30, 2021 | Sep. 30, 2020
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Raw materials | $ 23,071,833 | $ 12,287,134
Work-in-process | 2,481,890 | 1,033,021
Finished goods | 3,361,576 | 2,048,514
Inventories, gross | 28,915,299 | 15,368,669
Inventory reserve | (1,390,988) | (960,131)
Inventories, net | $ 27,524,311 | $ 14,408,538

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