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Note 6 - Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Cash and Cash Equivalents $ 1,794,583 $ 550,135 $ 725,420 $ 724,721
Demand Deposits [Member]        
Cash and Cash Equivalents 1,045,785 550,135    
US Treasury Securities [Member]        
Cash and Cash Equivalents $ 748,798