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Note 10 - Series B Mandatorily Redeemable Preferred Stock (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Interest Expense, Total | $ 2,143,960 | $ 2,830,858 | $ 6,971,162 | $ 7,867,932 |
Redeemable Convertible Preferred Stock Series B [Member] |  |  |  |  |
Stock Redeemed or Called During Period, Shares (in shares) |  |  |  |  | 16,900
Stock Redeemed or Called During Period, Value |  |  |  |  | $ 16,900,000
Preferred Stock, Shares Outstanding, Ending Balance (in shares) | 0 |  | 0 |  | 0
Interest Expense, Total |  |  | $ 0 | $ 122,000 |
Unamortized Deferred Stock Costs | $ 0 |  | $ 0 |  | $ 0

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