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Note 5 - Inventories - Components of Inventories (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Raw materials $ 2,762,009 $ 3,062,830
Work-in-process 234,023 159,482
Finished goods 26,977 64,227
Totals $ 3,023,009 $ 3,286,539