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Note 3 - Company Operations - Customers Representing 5% or More of Total Revenue (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue by Customer $ 394,033 $ 397,005 $ 740,728 $ 595,776
Major Customers 1 [Member]        
Revenue by Customer     250,334 179,292
Major Customers 2 [Member]        
Revenue by Customer     77,137 80,210
Major Customers 3 [Member]        
Revenue by Customer     73,110 54,154
Major Customers 4 [Member]        
Revenue by Customer     47,567 42,513
Major Customers 5 [Member]        
Revenue by Customer     $ 38,333 $ 38,333