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Note 8 - Significant Customers / Concentration / Disaggregated Revenue (Tables)
6 Months Ended
Jun. 30, 2020
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,

 
  

2020

  

2019

  

2020

  

2019

 

Customer A

  18%  33%  30%  30%

Customer B

  15%  *   13%  * 

Customer D

  *   10%  *   12%

Customer E

  *   43%  *   33%
  

June 30,

2020

  

December 31,

2019

 

Customer A

  26%  39%

Customer B

  25%  15%

Customer C

  *   17%

Customer D

  11%  *