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Note 6 - Business Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($)	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Aug. 31, 2018	Aug. 22, 2018
Goodwill, Ending Balance	$ 105,757,891	$ 98,685,795
Key Outdoor, Inc [Member]
Structures and displays	6,927,808	9,603,838
Structures and displays, adjustment	(2,676,030)
Goodwill, Ending Balance	21,257,030	19,499,000
Goodwill, adjustment	1,758,030
Total Intangible Assets	31,151,030	28,475,000
Total Intangible Assets, adjustment	2,676,030
Accounts receivable
Prepaid expenses	233,894	233,894
Total Other Assets	233,894	233,894
Total Assets Acquired	38,312,732	38,312,732
Accounts payable and accrued expenses
Asset retirement obligations	(78,838)	(78,838)
Other long-term liabilities
Total Liabilities Assumed	(78,838)	(78,838)
Total	38,233,894	38,233,894		$ 38,000,000
Key Outdoor, Inc [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	8,627,000	7,692,000
Intangible Assets, adjustment	935,000
Key Outdoor, Inc [Member] | Permits, Licenses and Lease Acquisition Costs [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	1,167,000	1,184,000
Intangible Assets, adjustment	(17,000)
Key Outdoor, Inc [Member] | Easements [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total
Key Outdoor, Inc [Member] | Off-Market Favorable Lease [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total
Key Outdoor, Inc [Member] | Noncompetition and Nonsolicitation Agreements [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	100,000	100,000
Waitt Outdoor, LLC [Member]
Structures and displays	16,220,375	19,723,904
Structures and displays, adjustment	(3,503,529)
Goodwill, Ending Balance	48,650,475	46,381,946
Goodwill, adjustment	2,268,529
Total Intangible Assets	68,596,038	65,092,509
Total Intangible Assets, adjustment	3,503,529
Accounts receivable	1,239,457	1,239,457
Prepaid expenses	1,551,084	1,551,084
Total Assets Acquired	87,606,954	87,606,954
Accounts payable and accrued expenses	(761,779)	(761,779)
Asset retirement obligations	(1,497,913)	(1,497,913)
Other long-term liabilities	(1,316,000)	(1,316,000)
Total Liabilities Assumed	(3,575,692)	(3,575,692)
Total	84,031,262	84,031,262	$ 82,000,000
Total Other Assets	2,790,541	2,790,541
Waitt Outdoor, LLC [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	13,984,000	12,696,000
Intangible Assets, adjustment	1,288,000
Waitt Outdoor, LLC [Member] | Permits, Licenses and Lease Acquisition Costs [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	5,288,000	5,341,000
Intangible Assets, adjustment	(53,000)
Waitt Outdoor, LLC [Member] | Easements [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	454,563	454,563
Waitt Outdoor, LLC [Member] | Off-Market Favorable Lease [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total
Waitt Outdoor, LLC [Member] | Noncompetition and Nonsolicitation Agreements [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	$ 219,000	$ 219,000

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- Definition

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