Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Inventories (Details)

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Summary of Significant Accounting Policies - Inventories (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Summary of Significant Accounting Policies    
Finished goods $ 3,183,263 $ 2,732,823
Work in process 252,354 237,108
Raw materials 1,080,323 964,029
Inventory, Net 4,515,940 3,933,960
Inventory valuation reserves $ 828,000 $ 711,000