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Note 3 - Restricted Cash (Tables) | 9 Months Ended
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Sep. 30, 2019
Notes Tables |
Restrictions on Cash and Cash Equivalents [Table Text Block] |
|  | September 30, |  |  | December 31, |
|  | 2019 |  |  | 2018 |
Insurance premium escrow |  | $ | 405,335 |  |  | $ | 1,038,767 |
|  | September 30, |  |  | September 30, |
|  | 2019 |  |  | 2018 |
Cash and cash equivalents |  | $ | 9,622,876 |  |  | $ | 4,817,750 |
Restricted cash |  |  | 405,335 |  |  |  | 771,549 |
Total Cash, Cash Equivalents, and Restricted Cash as Presented in the Consolidated Statement of Cash Flows |  | $ | 10,028,211 |  |  | $ | 5,589,299 |

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