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Note 7 - Inventories, Net - Inventories (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Raw materials $ 1,852,768 $ 1,994,741
Work in process 3,124,781 3,052,224
Finished goods 13,462,890 14,934,581
In transit 148,183 480,716
Allowance for excess quantities (243,216) (454,774)
Total inventories $ 18,345,406 $ 20,007,488