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Note 3 - Restricted Cash (Tables) | 6 Months Ended
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Jun. 30, 2019
Notes Tables |
Restrictions on Cash and Cash Equivalents [Table Text Block] |
|  | June 30, |  |  | December 31, |
|  | 2019 |  |  | 2018 |
Insurance premium escrow |  | $ | 706,317 |  |  | $ | 1,038,767 |
|  | June 30, |  |  | June 30, |
|  | 2019 |  |  | 2018 |
Cash and cash equivalents |  | $ | 11,656,150 |  |  | $ | 88,166,783 |
Restricted cash |  |  | 706,317 |  |  |  | 506,046 |
Total Cash, Cash Equivalents, and Restricted Cash as Presented in the Consolidated Statements of Cash Flows |  | $ | 12,362,467 |  |  | $ | 88,672,829 |

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