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Note 3 - Inventories
3 Months Ended
Mar. 31, 2018
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 March 31, 2018 and December 31, 2017 were as follows:

 

   March 31,  December 31,
   2018  2017
Raw materials and sub-assemblies  $3,079,027   $3,016,327 
Finished goods   72,531    67,120 
Inventory reserves   (872,310)   (885,181)
Inventory, net  $2,279,248  $2,198,266