Annual report pursuant to Section 13 and 15(d)

Inventories (Details)

v3.8.0.1
Inventories (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Inventories    
Finished goods $ 5,489,360 $ 4,132,036
Work in process 470,187 205,116
Raw materials 1,356,395 1,121,688
Inventories 7,315,942 5,458,840
Inventory valuation reserves $ 812,000 $ 960,000