XML 24 R13.htm IDEA: XBRL DOCUMENT v3.10.0.1
Inventories
9 Months Ended
Sep. 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: 

 

 

September 30, 2018

December 31, 2017

Raw material

 $             2,231,154

 

 $             1,812,603

Work-in-process

                1,828,478

 

                1,604,867

Finished goods

                1,784,701

 

                1,674,630

Inventory, gross

                5,844,333

 

                5,092,100

Valuation reserves

                  (590,000)

 

                  (564,000)

Inventories, net

 $             5,254,333

 

 $             4,528,100