XML 34 R22.htm IDEA: XBRL DOCUMENT
v3.20.2

Note 2 - Summary of Significant Accounting Policies (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2020
Notes Tables |
Cash, Cash Equivalents and Investments [Table Text Block] |
|  | As of |
|  | June 30, 2020 |  |  | December 31, 2019 |
Cash and cash equivalents |  | $ | 53,065,833 |  |  | $ | 65,249,072 |
Restricted cash-short term |  |  | — |  |  |  | 95,737,862 |
Cash, cash equivalents and restricted cash |  | $ | 53,065,833 |  |  | $ | 160,986,934 |
|  | June 30, 2019 |  |  | December 31, 2018 |
Cash and cash equivalents |  | $ | 100,263,915 |  |  | $ | 100,652,809 |
Restricted cash-short term |  |  | 11,248,400 |  |  |  | 11,452,078 |
Restricted cash-long term |  |  | 64,480,624 |  |  |  | 68,292,023 |
Cash, cash equivalents and restricted cash |  | $ | 175,992,939 |  |  | $ | 180,396,910 |

X
- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
Name: | us-gaap_ScheduleOfCashCashEquivalentsAndShortTermInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration