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Note 11 - Concentrations
12 Months Ended
Dec. 31, 2021
Notes to Financial Statements  
Concentration Risk Disclosure [Text Block]

(11)

Concentrations

 

Three customers accounted for approximately 67%, 13% and 13% of total revenues in 2021. Two customers accounted for approximately 70% and 16% of total revenues in 2020. Four customers accounted for approximately 24%, 14%, 12% and 12% of accounts receivable on December 31, 2021. Three customers accounted for approximately 22%, 18% and 11% of accounts receivable on December 31, 2020.