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Note 9 - Series B Mandatorily Redeemable Preferred Stock (Details Textual) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 01, 2017 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2015 shares
Debt Issuance Costs, Net, Total |  | $ 500,000 |  | $ 500,000 |  |  |  |
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] |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued, Total (in shares) | shares |  |  |  |  |  | 0 | 16,900 | 35,000
Debt Instrument, Number of Extension Options | 2 |  |  |  |  |  |  |
Debt Instrument, Term of Extension Options (Year) | 1 year |  |  |  |  |  |  |
Preferred Stock, Redemption Extension Fee | $ 307,000 |  |  |  |  |  |  |
Debt Issuance Costs, Net, Total | $ 3,100,000 |  |  |  |  |  |  |
Interest Expense, Total |  |  | $ 61,000 |  | $ 122,000 | $ 122,000 | $ 147,000 |
Unamortized Deferred Stock Costs |  | $ 0 |  | $ 0 |  | $ 0 | $ 122,000 |
Stock Redeemed or Called During Period, Shares (in shares) | shares |  |  |  |  |  | 16,900 | 13,800 |
Stock Redeemed or Called During Period, Value |  |  |  |  |  | $ 16,900,000 | $ 13,800,000 |

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