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Note 6 - Business Acquisitions - Schedule of Allocation of the Purchase Price (Details) - USD ($) | Sep. 30, 2018 | Aug. 31, 2018 | Aug. 22, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Goodwill | $ 98,479,795 |  |  | $ 24,692,161
Tammy Lynn Outdoor, LLC [Member] |  |  |  |
Structures, displays, and equipment | 2,147,305 |  |  |
Goodwill | 7,592,688 |  |  |
Total Intangible Assets | 14,352,688 |  |  |
Accounts receivable | 188,261 |  |  |
Prepaid expenses |  |  |  |
Total Other Assets | 188,261 |  |  |
Total Assets Acquired | 16,688,254 |  |  |
Accounts payable and accrued expenses |  |  |  |
Asset retirement obligations |  |  |  |
Other long-term liabilities |  |  |  |
Total Liabilities Assumed |  |  |  |
Total | 16,688,254 |  |  |
Tammy Lynn Outdoor, LLC [Member] | Customer Relationships [Member] |  |  |  |
Intangible assets acquired | 4,432,000 |  |  |
Tammy Lynn Outdoor, LLC [Member] | Permits, Licenses and Lease Acquisition Costs [Member] |  |  |  |
Intangible assets acquired | 893,000 |  |  |
Tammy Lynn Outdoor, LLC [Member] | Easements [Member] |  |  |  |
Intangible assets acquired |  |  |  |
Tammy Lynn Outdoor, LLC [Member] | Off-Market Favorable Lease [Member] |  |  |  |
Intangible assets acquired | 1,425,000 |  |  |
Tammy Lynn Outdoor, LLC [Member] | Noncompetition and Nonsolicitation Agreements [Member] |  |  |  |
Intangible assets acquired | 10,000 |  |  |
Key Outdoor, Inc [Member] |  |  |  |
Structures, displays, and equipment | 9,565,481 |  |  |
Goodwill | 19,499,000 |  |  |
Total Intangible Assets | 28,475,000 |  |  |
Accounts receivable |  |  |  |
Prepaid expenses | 233,894 |  |  |
Total Other Assets | 233,894 |  |  |
Total Assets Acquired | 38,274,375 |  |  |
Accounts payable and accrued expenses |  |  |  |
Asset retirement obligations | (40,481) |  |  |
Other long-term liabilities |  |  |  |
Total Liabilities Assumed | (40,481) |  |  |
Total | 38,233,894 |  | $ 38,000,000 |
Key Outdoor, Inc [Member] | Customer Relationships [Member] |  |  |  |
Intangible assets acquired | 7,692,000 |  |  |
Key Outdoor, Inc [Member] | Permits, Licenses and Lease Acquisition Costs [Member] |  |  |  |
Intangible assets acquired | 1,184,000 |  |  |
Key Outdoor, Inc [Member] | Easements [Member] |  |  |  |
Intangible assets acquired |  |  |  |
Key Outdoor, Inc [Member] | Off-Market Favorable Lease [Member] |  |  |  |
Intangible assets acquired |  |  |  |
Key Outdoor, Inc [Member] | Noncompetition and Nonsolicitation Agreements [Member] |  |  |  |
Intangible assets acquired | 100,000 |  |  |
Waitt Outdoor, LLC [Member] |  |  |  |
Structures, displays, and equipment | 20,101,630 |  |  |
Goodwill | 46,381,946 |  |  |
Total Intangible Assets | 65,092,509 |  |  |
Accounts receivable | 1,239,457 |  |  |
Prepaid expenses | 1,551,084 |  |  |
Total Other Assets | 2,790,541 |  |  |
Total Assets Acquired | 87,984,680 |  |  |
Accounts payable and accrued expenses | (761,779) |  |  |
Asset retirement obligations | (1,875,639) |  |  |
Other long-term liabilities | (1,316,000) |  |  |
Total Liabilities Assumed | (3,953,418) |  |  |
Total | 84,031,262 | $ 82,000,000 |  |
Waitt Outdoor, LLC [Member] | Customer Relationships [Member] |  |  |  |
Intangible assets acquired | 12,696,000 |  |  |
Waitt Outdoor, LLC [Member] | Permits, Licenses and Lease Acquisition Costs [Member] |  |  |  |
Intangible assets acquired | 5,341,000 |  |  |
Waitt Outdoor, LLC [Member] | Easements [Member] |  |  |  |
Intangible assets acquired | 454,563 |  |  |
Waitt Outdoor, LLC [Member] | Off-Market Favorable Lease [Member] |  |  |  |
Intangible assets acquired |  |  |  |
Waitt Outdoor, LLC [Member] | Noncompetition and Nonsolicitation Agreements [Member] |  |  |  |
Intangible assets acquired | 219,000 |  |  |
Tammy Lynn Outdoor, LLc, Key Outdoor, Inc and Waitt Outdoor, LLC [Member] |  |  |  |
Structures, displays, and equipment | 31,814,416 |  |  |
Goodwill | 73,473,634 |  |  |
Total Intangible Assets | 107,920,197 |  |  |
Accounts receivable | 1,427,718 |  |  |
Prepaid expenses | 1,784,978 |  |  |
Total Other Assets | 3,212,696 |  |  |
Total Assets Acquired | 142,947,309 |  |  |
Accounts payable and accrued expenses | (761,779) |  |  |
Asset retirement obligations | (1,916,120) |  |  |
Other long-term liabilities | (1,316,000) |  |  |
Total Liabilities Assumed | (3,993,899) |  |  |
Total | 138,953,410 |  |  |
Tammy Lynn Outdoor, LLc, Key Outdoor, Inc and Waitt Outdoor, LLC [Member] | Customer Relationships [Member] |  |  |  |
Intangible assets acquired | 24,820,000 |  |  |
Tammy Lynn Outdoor, LLc, Key Outdoor, Inc and Waitt Outdoor, LLC [Member] | Permits, Licenses and Lease Acquisition Costs [Member] |  |  |  |
Intangible assets acquired | 7,418,000 |  |  |
Tammy Lynn Outdoor, LLc, Key Outdoor, Inc and Waitt Outdoor, LLC [Member] | Easements [Member] |  |  |  |
Intangible assets acquired | 454,563 |  |  |
Tammy Lynn Outdoor, LLc, Key Outdoor, Inc and Waitt Outdoor, LLC [Member] | Off-Market Favorable Lease [Member] |  |  |  |
Intangible assets acquired | 1,425,000 |  |  |
Tammy Lynn Outdoor, LLc, Key Outdoor, Inc and Waitt Outdoor, LLC [Member] | Noncompetition and Nonsolicitation Agreements [Member] |  |  |  |
Intangible assets acquired | $ 329,000 |  |  |

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