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Note 7 - Concentrations - Customers Representing 5% or More of Total Revenue (Details) - USD ($)
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Major Customers 1 [Member]    
Revenue $ 175,020 $ 63,096
Major Customers 2 [Member]    
Revenue 32,884 56,089
Major Customers 3 [Member]    
Revenue 25,559 34,872
Major Customers 4 [Member]    
Revenue 24,034 34,003
Major Customers 5 [Member]    
Revenue $ 23,660 $ 33,073