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Inventories (Narrative) (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
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