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Note 2 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Cash, Cash Equivalents and Investments [Table Text Block] |
|  | As of December 31, |
|  | 2019 |  |  | 2018 |
Cash and cash equivalents |  | $ | 65,249,072 |  |  | $ | 100,652,809 |
Restricted cash - short-term |  |  | 95,737,862 |  |  |  | 11,452,078 |
Restricted cash - long-term |  |  | — |  |  |  | 68,292,023 |
Cash, cash equivalents and restricted cash |  | $ | 160,986,934 |  |  | $ | 180,396,910 |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
|  | Fair Value Measurements of Level 3 liability-classified warrant |
Warrant liability at December 31, 2020 |  | $ | 6,639,211 |
Decrease in fair value of warrant liability |  |  | (117,770 | )
Exercise of warrants |  |  | — |
Warrant liability at December 31, 2021 |  | $ | 6,521,441 |

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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