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Note 5 - Inventories - Components of Inventories (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Raw materials $ 1,943,000 $ 2,549,000
Work-in-process 782,000 390,000
Finished goods 27,000 27,000
Totals $ 2,751,504 $ 2,965,623