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Note 6 - Business Acquisitions (Details Textual) - USD ($) |  |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 30, 2019 | Aug. 31, 2018 | Aug. 22, 2018 | Jul. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  |  |  |  |  | $ 6,516,751 | $ 135,023,950 |
Goodwill, Ending Balance |  |  |  |  | $ 105,757,891 |  | $ 105,757,891 |  | $ 98,685,795
Minimum [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  | 2 years |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  | 2 years |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  | 15 years |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  | 50 years |  |
Image Outdoor Advertising, LLC [Member] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total | $ 6,915,501 |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 34,673 |  |  |  |  |  |  |  |
Business Combination, Amount Held Back and Disbursed | $ 398,750 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total | 1,565,065 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total | 3,145,000 |  |  |  |  |  |  |  |
Goodwill, Ending Balance | 3,045,538 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other | $ 129,999 |  |  |  |  |  |  |  |
Tammy Lynn Outdoor, LLC [Member] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  |  | $ 14,763,261 |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  |  | $ 340,006 |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  |  |  |  |  |  | (54,969) |
Business Combination, Acquisition Related Costs |  |  |  |  |  | 113,679 |  | 113,679 |
Tammy Lynn Outdoor, LLC [Member] | Common Class A [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions |  |  |  | 85,170 |  |  |  |  |
Key Outdoor, Inc [Member] |  |  |  |  |  |  |  |  |
Business Combination, Amount Held Back and Disbursed |  |  | $ 1,900,000 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total |  |  |  |  | 6,927,808 |  | $ 6,927,808 |  | 9,603,838
Goodwill, Ending Balance |  |  |  |  | 21,257,030 |  | 21,257,030 |  | 19,499,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other |  |  |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  |  | 555,992 |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  |  |  |  |  |  | (6,756) |
Business Combination, Acquisition Related Costs |  |  |  |  |  | 121,469 |  | 121,469 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total |  |  | 38,000,000 |  | 38,233,894 |  | 38,233,894 |  | 38,233,894
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred |  |  | 233,894 |  |  |  |  |  |
Business Combination, Amount Held Back as Required Consent Holdback |  |  | 329,467 |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 36,004,427 |  |  |  |  |  |
Payments on Short-term Payables for Business Acquisitions |  |  |  |  |  |  | 1,964,990 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Amortization |  |  |  |  | 335,797 |  | 335,797 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Depreciation |  |  |  |  | (193,269) |  | (193,269) |  |
Waitt Outdoor, LLC [Member] |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total |  |  |  |  | 16,220,375 |  | 16,220,375 |  | 19,723,904
Goodwill, Ending Balance |  |  |  |  | 48,650,475 |  | 48,650,475 |  | 46,381,946
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other |  |  |  |  | 1,316,000 |  | 1,316,000 |  | 1,316,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  |  | 1,117,509 |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  |  |  |  |  |  | 32,312 |
Business Combination, Acquisition Related Costs |  |  |  |  |  | $ 140,165 |  | $ 140,165 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total |  | $ 82,000,000 |  |  | 84,031,262 |  | 84,031,262 |  | $ 84,031,262
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred |  | 2,031,262 |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | 84,031,262 |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Amortization |  |  |  |  | 459,369 |  | 459,369 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Depreciation |  |  |  |  | $ (253,033) |  | $ (253,033) |  |
Other Restricted Assets, Noncurrent |  | $ 4,102,500 |  |  |  |  |  |  |

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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to depreciation expense in connection with a business combination for which the initial accounting was incomplete. + References No definition available. + Details
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- Definition Cash outflow for short-term payables for a business acquisition. + References No definition available. + Details
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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 4A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=SL65897772-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=116868840&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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