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Note 4 - Inventories - Components of Inventories (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Raw materials $ 2,549,016 $ 3,062,830
Work-in-process 389,630 159,482
Finished goods 26,977 64,227
Totals $ 2,965,623 $ 3,286,539