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Note 3 - Restricted Cash (Tables) | 9 Months Ended
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Sep. 30, 2018
Notes Tables |
Restrictions on Cash and Cash Equivalents [Table Text Block] |
|  | September 30, |  |  | December 31, |
|  | 2018 |  |  | 2017 |
Insurance premium escrow |  | $ | 586,428 |  |  | $ | 247,230 |
Billboard replacement reserve |  |  | 185,121 |  |  |  | 144,995 |
Total Restricted Cash |  | $ | 771,549 |  |  | $ | 392,225 |
|  | September 30, |
|  | 2018 |  |  | 2017 |
Cash and cash equivalents |  | $ | 4,817,750 |  |  | $ | 102,810,133 |
Restricted cash |  |  | 771,549 |  |  |  | 649,680 |
Total Cash, Cash Equivalents, and Restricted Cash as Presented in the Consolidated Statement of Cash Flows |  | $ | 5,589,299 |  |  | $ | 103,459,813 |

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