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 ($)
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Balance $ 583,734 $ 3,852,882
Change in fair value - loss (gain) (96,011) (1,569,049)
Balance $ 487,723 $ 2,283,833