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Note 5 - Accounts Receivable and Customer Concentrations (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   

Revenue

   

Accounts Receivable

 
   

2023

   

2022

   

2023

   

2022

 

Customer A

    67%       75%       57%       76%  

Customer B

    *       *       12%       *