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Note 15 - Significant Customers (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
  

Year Ended December 31,

 

Customer

 

2021

  

2020

  

2019

 

Distributor A

  26%  24%  23%

Distributor B

  15%  11%  * 

Distributor C

  10%  *   * 
  

December 31,

 
  

2021

  

2020

 

Distributor A

  26%  24%

Distributor B

  17%  21%

Value-added reseller A

  12%  13%

Direct customer A

  *   10%