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Note 4 - Inventories - Components of Inventories (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Raw materials $ 3,062,830 $ 2,718,328
Work-in-process 159,482 174,698
Finished goods 64,227 93,404
Totals $ 3,286,539 $ 2,986,430