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Note 9 - Series B Mandatorily Redeemable Preferred Stock (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Interest Expense, Total | $ 8,813,067 | $ 10,649,646
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
Interest Expense, Total | $ 0 | $ 100,000
Unamortized Deferred Stock Costs | $ 0 | $ 0
Preferred Stock, Shares Issued, Total (in shares) | 0 | 0

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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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