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Note 6 - Segment Reporting (Details Textual)
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Number of Operating Segments     3  
Revenues, Total $ 216,808 $ 394,033 $ 370,283 $ 740,728
Intersegment Eliminations [Member]        
Revenues, Total     $ 0 $ 0