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Note 3 - Restricted Cash (Tables) | 9 Months Ended
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Sep. 30, 2020
Notes Tables |
Restrictions on Cash and Cash Equivalents [Table Text Block] |
|  | September 30, |  |  | December 31, |
|  | 2020 |  |  | 2019 |
Insurance premium escrow |  | $ | 381,113 |  |  | $ | 343,518 |
|  | September 30, |  |  | December 31, |
|  | 2020 |  |  | 2019 |
Cash and cash equivalents |  | $ | 42,270,664 |  |  | $ | 16,028,514 |
Restricted cash |  |  | 381,113 |  |  |  | 343,518 |
Total Cash, Cash Equivalents, and Restricted Cash as Presented in the Consolidated Statement of Cash Flows |  | $ | 42,651,777 |  |  | $ | 16,372,032 |

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