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Note 4 - Segment Reporting (Details Textual)
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Number of Operating Segments     3  
Revenues, Total $ 211,306 $ 188,697 $ 366,182 $ 369,088
Intersegment Eliminations [Member]        
Revenues, Total     $ 0 $ 0