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Note 3 - Restricted Cash (Tables) | 6 Months Ended
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Jun. 30, 2018
Notes Tables |
Restrictions on Cash and Cash Equivalents [Table Text Block] |
|  | June 30, |  |  | December 31, |
|  | 2018 |  |  | 2017 |
Insurance premium escrow |  | $ | 330,971 |  |  | $ | 247,230 |
Billboard replacement reserve |  |  | 175,075 |  |  |  | 144,995 |
Total Restricted Cash |  | $ | 506,046 |  |  | $ | 392,225 |
|  | June 30, |
|  | 2018 |  |  | 2017 |
Cash and cash equivalents |  | $ | 88,166,783 |  |  | $ | 101,717,930 |
Restricted cash |  |  | 506,046 |  |  |  | 404,822 |
Total Cash, Cash Equivalents, and Restricted Cash as Presented in the Consolidated Statements of Cash Flows |  | $ | 88,672,829 |  |  | $ | 102,122,752 |

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