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Note 4 - Inventories - Components of Inventories (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Raw materials | $ 2,016,488 | $ 3,156,016
Work-in-process | 205,385 | 389,630
Finished goods |  | 26,977
Gross inventories | 2,221,873 | 3,572,623
Less reserve for obsolescence | (360,000) | (607,000)
Inventories, net | $ 1,861,873 | $ 2,965,623

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