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Note 10 - Series B Mandatorily Redeemable Preferred Stock (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Interest Expense, Total | $ 2,273,355 | $ 2,491,870 | $ 4,827,202 | $ 5,037,073 | $ 10,649,646 | $ 13,041,016
Redeemable Convertible Preferred Stock Series B [Member] |  |  |  |  |  |
Stock Redeemed or Called During Period, Shares (in shares) |  |  |  |  | 16,900 | 13,800
Stock Redeemed or Called During Period, Value |  |  |  |  | $ 16,900,000 | $ 13,800,000
Preferred Stock, Shares Outstanding, Ending Balance (in shares) | 0 |  | 0 |  | 0 | 16,900
Interest Expense, Total |  | $ 61,000 |  | $ 122,000 | $ 122,000 | $ 147,000
Unamortized Deferred Stock Costs | $ 0 |  | $ 0 |  | $ 0 | $ 122,000

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