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Note 4 - Segment Reporting (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Number of Operating Segments     3  
Revenues, Total $ 173,546 $ 160,842 $ 539,729 $ 529,930
Intersegment Eliminations [Member]        
Revenues, Total     $ 0 $ 0