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Note 15 - Significant Customers (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
  

Year Ended December 31,

 

Customer

 

2020

  

2019

  

2018

 

Distributor A

  24%  23%  22%

Distributor B

  11%  *   10%
  

December 31,

 
  

2020

  

2019

 

Distributor A

  24%  24%

Distributor B

  21%  11%

Value-added reseller A

  13%  13%

Direct customer A

  10%  *