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Note 3 - Inventories
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Inventories

NOTE 3 — Inventories

 

Inventories consist principally of raw materials and sub-assemblies, which are stated at the lower of cost (first-in, first-out) or market. Inventories at June 30, 2020 and December 31, 2019 were as follows:

 

   June 30,  December 31,
   2020  2019
Raw materials and sub-assemblies  $3,545,065   $3,767,588 
Finished goods   356,283    241,681 
Inventory reserves   (647,639   (830,361
Inventory, net  $3,253,709  $3,178,908