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 ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Balance $ 583,734 $ 3,852,882
Change in fair value - loss 340,115 (190,219)
Balance $ 923,849 $ 3,662,663