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Note 3 - Restricted Cash (Tables) | 6 Months Ended
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Jun. 30, 2021
Notes Tables |
Restrictions on Cash and Cash Equivalents [Table Text Block] |
|  | June 30, |  |  | December 31, |
|  | 2021 |  |  | 2020 |
Insurance premium escrow |  | $ | 203,319 |  |  | $ | 280,269 |
Cash held in trust |  |  | 7,561 |  |  |  | - |
|  | $ | 210,880 |  |  | $ | 280,269 |
|  | June 30, |  |  | December 31, |
|  | 2021 |  |  | 2020 |
Cash and cash equivalents |  | $ | 57,133,444 |  |  | $ | 44,665,972 |
Funds held as collateral |  |  | 8,349,537 |  |  |  | 10,006,075 |
Restricted cash |  |  | 210,880 |  |  |  | 280,269 |
Total Cash, Cash Equivalents, and Restricted Cash as Presented in the Consolidated Statement of Cash Flows |  | $ | 65,693,861 |  |  | $ | 54,952,316 |

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