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Note 4 - Inventories
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Inventories

NOTE 4 — 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 March 31, 2021 and December 31, 2020 were as follows:

 

   March 31,  December 31,
   2021  2020
Raw materials and sub-assemblies  $4,087,028   $3,642,377 
Finished goods   393,831    281,104 
Inventory reserves   (755,943   (727,639
Inventory, net  $3,724,916  $3,195,842