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Note 2 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Disaggregation of Revenue [Table Text Block]
  

December 31,

2021

  

December 31,

2020

 

Geographic Market

        

International

  17

%

  19

%

United States

  83

%

  81

%

         

Customer Type

        

Retailer

  38

%

  43

%

Distribution

  62

%

  57

%