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Inventories
 3 Months Ended
Mar. 31, 2019
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:

 

 

 

March 31, 2019

December 31, 2018

Raw material

 $             3,086,524

 

 $             2,798,918

Work-in-process

                2,289,540

 

                1,878,977

Finished goods

                2,033,395

 

                2,001,496

Inventory, gross

                7,409,459

 

                6,679,391

Valuation reserves

                  (577,000)

 

                  (579,000)

Inventories, net

 $             6,832,459

 

 $             6,100,391