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Note 3 - Restricted Cash (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Restrictions on Cash and Cash Equivalents [Table Text Block] |
|  | December 31,
|  | 2018 |  | 2017
Insurance premium escrow |  | $ | 1,038,767 |  |  | $ | 247,230 |
Billboard replacement reserve |  |  | - |  |  |  | 144,995 |
Total Restricted Cash |  | $ | 1,038,767 |  |  | $ | 392,225 |
|  | December 31,
|  | 2018 |  | 2017
Cash and cash equivalents |  | $ | 17,105,072 |  |  | $ | 6,838,345 |
Restricted cash |  |  | 1,038,767 |  |  |  | 392,225 |
Total Cash, Cash Equivalents, and Restricted Cash as Presented in the Consolidated Statement of Cash Flows |  | $ | 18,143,839 |  |  | $ | 7,230,570 |

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