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Note 3 - Company Operations (Details Textual)
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Number of Operating Segments     3  
Revenues, Total $ 394,033 $ 397,005 $ 740,728 $ 595,776
Intersegment Eliminations [Member]        
Revenues, Total $ 0 $ 0 $ 0 $ 0