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Inventories
 6 Months Ended
Jun. 30, 2020
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, 2020

 

December 31, 2019

Raw material

$       2,315,730   

 

$       2,337,278   

Work-in-process

1,091,787   

 

1,201,099   

Finished goods

1,865,269   

 

1,869,800   

Inventories, gross

5,272,786   

 

5,408,177   

Valuation reserves

(527,000)  

 

(457,000)  

Inventories, net

$       4,745,786   

 

$       4,951,177