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Note 7 - Inventory (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
 
 
June 30,
 
 
December 31,
 
 
 
201
9
 
 
201
8
 
 
 
 
 
 
 
 
 
 
Finished goods
 
$
499,426
 
 
$
496,358
 
Fabricated assemblies
 
 
512,277
 
 
 
502,471
 
Total inventory
 
$
1,011,703
 
 
$
998,829