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Note 7 - Inventories, Net - Inventories (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Raw materials $ 2,085,908 $ 1,994,741
Work in process 3,057,682 3,052,224
Finished goods 15,508,804 14,934,581
In Transit 293,138 480,716
Allowance for excess quantities (426,292) (454,774)
Total inventories $ 20,519,240 $ 20,007,488