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Note 3 - Restricted Cash (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Restrictions on Cash and Cash Equivalents [Table Text Block] |
|  | December 31, |
|  | 2019 |  |  | 2018 |
Insurance premium escrow |  | $ | 343,518 |  |  | $ | 1,038,767 |
|  | December 31, |
|  | 2019 |  |  | 2018 |
Cash and cash equivalents |  | $ | 16,028,514 |  |  | $ | 17,105,072 |
Restricted cash |  |  | 343,518 |  |  |  | 1,038,767 |
Total Cash, Cash Equivalents, and Restricted Cash as Presented in the Consolidated Statements of Cash Flows |  | $ | 16,372,032 |  |  | $ | 18,143,839 |

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