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Inventories
6 Months Ended
Jun. 30, 2018
Notes  
Inventories

6.  Inventories are stated at the lower of cost or net realizable value, cost being determined by the first-in, first-out method.

 

  A summary of inventories is as follows: 

 

 

June 30, 2018

December 31, 2017

Raw material

 $             2,377,560

 

 $             1,812,603

Work-in-process

                1,559,978

 

                1,604,867

Finished goods

                2,103,683

 

                1,674,630

Inventory, gross

                6,041,221

 

                5,092,100

Valuation reserves

                  (591,000)

 

                  (564,000)

Inventories, net

 $             5,450,221

 

 $             4,528,100