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Note 9 - Significant Customers / Concentration / Disaggregated Revenue (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
  

For the Three Months

  

For the Six Months

 
  

Ended June 30,

  

Ended June 30,

 
  

2021

  

2020

  

2021

  

2020

 

Customer A

  12

%

  -   11

%

  -

%

Customer B

  -   18

%

  -   30

%

Customer C

  -   15

%

  -   13

%

  

June 30,

2021

  

December 31,

2020

 

Customer A

  12

%

  16

%

Customer B

  -   39

%

Customer D

  12

%

  12

%