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Inventories (Narrative) (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
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Inventory [Line Items] |  |
Reserve for potential obsolescence of products | $ 100,000 | $ 300,000
Raw materials and work in process | 18,383,018 | 18,378,450
Finished goods, net of reserve | 8,054,574 | 8,511,887
Vibativ |  |
Inventory [Line Items] |  |
Raw materials and work in process | 14,900,000 | 14,900,000
Finished goods, net of reserve | $ 900,000 | $ 800,000

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