Inventories

3 Months Ended

Mar. 31, 2021

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, 2021	December 31, 2020
Raw material	$             2,734,512	$             2,245,709
Work-in-process	2,081,169	1,410,868
Finished goods	2,095,279	2,096,717
Inventory, gross	6,910,960	5,753,294
Valuation reserves	(599,000)	(600,000)
Inventories, net	$             6,311,960	$             5,153,294