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Note 3 - Summary of Significant Accounting Policies - Fair Value of Level 3 Instruments (Details)
9 Months Ended
Sep. 30, 2019
USD ($)
Balance at end of period $ 1,016,639
Derivative Financial Instruments, Liabilities [Member]  
Balance at beginning of year
Warrants issued in connection with public offering (See Note 8) 376,497
Change in fair value of derivative liability (674,792)
Exercise of liability classified warrants $ (34,650)