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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Inventories    
Reserve for inventory obsolescence $ 5,000 $ 7,000
Major components of inventories    
Raw materials 1,438,471 1,640,098
Work-in-progress 355,208 375,229
Finished goods 1,319,856 1,336,707
Reduction to LIFO cost (1,127,363) (1,232,229)
Total inventories $ 1,986,172 $ 2,119,805