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Note 12 - Significant Customers / Concentration (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
  

For the Year Ended December 31,

 
  

2020

  

2019

 

Customer A

  27

%

  29

%

Customer B

  10

%

  15

%

Customer C

  -

%

  18

%

  

December 31,

2020

  

December 31,

2019

 

Customer A

  39

%

  39

%

Customer B

  12

%

  -

%

Customer D

  16

%

  -

%

Customer E

  -

%

  15

%