XML 35 R24.htm IDEA: XBRL DOCUMENT v3.20.2
Inventory Components (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Notes to Financial Statements    
Raw materials and sub-assemblies $ 3,661,671 $ 3,767,588
Finished goods 398,282 241,681
Inventory reserves (697,639) (830,361)
Inventories, net $ 3,362,314 $ 3,178,908