Note 15 - Subsequent Events (Details Textual) - USD ($) |
2 Months Ended | 9 Months Ended | 12 Months Ended | ||||
---|---|---|---|---|---|---|---|
Nov. 16, 2020 |
Sep. 30, 2020 |
Sep. 30, 2019 |
Sep. 30, 2021 |
Dec. 31, 2019 |
Jun. 30, 2019 |
Dec. 31, 2018 |
|
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1.95 | $ 0.50 | $ 1.49 | $ 2.55 | |||
Proceeds from Warrant Exercises | $ 985,763 | $ 28,875 | |||||
Forecast [Member] | Consultant [Member] | |||||||
Stock Issued During Period, Value, Issued for Services | $ 60,000 | ||||||
First Warrants Exercised Subsequent to June 30, 2020 [Member] | Subsequent Event [Member] | |||||||
Stock Issued During Period Shares, Warrants Exercised (in shares) | 8,000 | ||||||
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1.20 | ||||||
Proceeds from Warrant Exercises | $ 9,600 |