Quarterly report pursuant to Section 13 or 15(d)

Note 3 - Fair Value Measurements - Activity for Items Measured at Fair Value on a Recurring Basis (Details)

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Note 3 - Fair Value Measurements - Activity for Items Measured at Fair Value on a Recurring Basis (Details) - Stock Purchase Warrants [Member] - USD ($)
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Balance $ 3,852,882 $ 3,921,917
Change in fair value (1,805,319) 403,155
Issuance of warrants   2,483,848
Exercise of warrants   (4,023,057)
Balance $ 2,047,563 $ 2,785,863