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Note 6 - Business Acquisitions (Details Textual) - USD ($) |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2018 | Aug. 22, 2018 | Jul. 31, 2018 | Nov. 30, 2017 | Oct. 31, 2017 | Jul. 11, 2017 | Jun. 16, 2017 | Jun. 08, 2017 | Jan. 31, 2017 | Jan. 09, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2018
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  |  |  |  |  |  |  |  |  | $ 134,798,950 | $ 12,232,298 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total |  |  |  |  |  |  |  |  |  |  |  | 17,165,971 |
Repayments of Short-term Debt, Total |  |  |  |  |  |  |  |  |  |  | $ 725,857 |  |
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 |  |
Customer Relationships [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  |  |  | 2 years |  |
Customer Relationships [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Tammy Lynn Outdoor, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  | $ 14,763,261 |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Total |  |  | $ 16,463,254 |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total |  |  |  |  |  |  |  |  |  |  | $ 16,463,254 |  | $ 16,688,254
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  |  |  |  |  |  |  |  | (225,000) |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  |  |  |  |  |  |  | 206,000 |  |
Tammy Lynn Outdoor, LLC [Member] | Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions |  |  | 85,170 |  |  |  |  |  |  |  |  |  |
Key Outdoor, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total |  | $ 38,000,000 |  |  |  |  |  |  |  |  | 38,233,894 |  | 38,233,894
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred |  | 233,894 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Amount Held Back and Disbursed |  | 1,900,000 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Amount Held Back as Required Consent Holdback |  | 329,467 |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 36,004,427 |  |  |  |  |  |  |  |  |  |  |
Repayments of Short-term Debt, Total |  |  |  |  |  |  |  |  |  |  | 228,857 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Waitt Outdoor, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total | $ 82,000,000 |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |
Other Restricted Assets, Noncurrent | $ 4,102,500 |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Key Outdoor, Inc and Waitt Outdoor, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisitions, Provisional Purchase Price Allocation, Increase (Decrease) |  |  |  |  |  |  |  |  |  |  | (225,000) |  |
Amortization, Purchase Accounting Adjustments |  |  |  |  |  |  |  |  |  |  | (9,633) |  |
Depreciation, Purchase Accounting Adjustment |  |  |  |  |  |  |  |  |  |  | (1,347) |  |
Accretion, Purchase Accounting Adjustment |  |  |  |  |  |  |  |  |  |  | 10,050 |  |
Clear Channel Outdoor Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  |  |  |  |  | $ 2,983,444 |  |  |
Other Restricted Assets, Noncurrent |  |  |  |  |  |  |  |  |  | $ 2,950,000 |  |  |
Hartlind Outdoor LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  |  |  |  | $ 2,817,000 |  |  |  |
Corey Companies Inc. [Member] | Southeastern US [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  |  |  | $ 2,991,314 |  |  |  |  |
Amortization, Purchase Accounting Adjustments |  |  |  |  |  |  |  |  |  |  | (64,965) |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  |  |  |  |  |  |  | 314,000 |  |
Corey Companies Inc. [Member] | Southeastern US [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  |  |  |  |  |  |  |  | (314,000) |  |
Vision Outdoor Media LLC [Member] | Southeastern US [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  |  | $ 3,199,036 |  |  |  |  |  |
View Media, LLC [Member] | Southeastern US [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  | $ 623,596 |  |  |  |  |  |  |
Series of Individually Immaterial Business Acquisitions [Member] | Southeastern US [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  | 900,000 |  |  |  |  |  |  |
Surety Support Services, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Total |  |  |  |  |  | 450,000 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total |  |  |  |  |  |  |  |  |  |  |  | 450,000 |
Payments to Acquire Businesses, Gross |  |  |  |  |  | $ 22,500 |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  | 100.00% |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  |  |  |  |  | $ 427,500 |  |  |  |  |  |  |
Repayments of Short-term Debt Related to Acquisition |  |  |  |  |  |  |  |  |  |  | 427,500 |  |
South Coast Surety Insurance Services, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Total |  |  |  |  | $ 2,908,581 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total |  |  |  |  |  |  |  |  |  |  |  | 2,908,581 |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  | 70.00% |  |  |  |  |  |  |  |
Remaining Ownership Interest Percentage |  |  |  |  | 30.00% |  |  |  |  |  |  |  |
Free State Bonds Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Total |  |  |  | $ 293,000 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total |  |  |  |  |  |  |  |  |  |  |  | 293,000 |
Payments to Acquire Businesses, Gross |  |  |  | $ 223,500 |  |  |  |  |  |  |  |  |
Repayments of Short-term Debt, Total |  |  |  |  |  |  |  |  |  |  | 68,500 |  |
Amortization, Purchase Accounting Adjustments |  |  |  |  |  |  |  |  |  |  | (64,965) | 178,512 |
Depreciation, Purchase Accounting Adjustment |  |  |  |  |  |  |  |  |  |  |  | 31,513 |
Goodwill, Purchase Accounting Adjustments |  |  |  |  |  |  |  |  |  |  | 314,000 |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  |  |  | $ 69,500 |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount, Total |  |  |  |  |  |  |  |  |  |  | 1,000 |  |
Net Loss, Purchase Accounting Adjustments |  |  |  |  |  |  |  |  |  |  |  | $ 210,025 |
Free State Bonds Inc. [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  |  |  |  |  |  |  |  | $ (314,000) |  |

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- Definition Amount of increase (decrease) in accretion from adjustments after acquisition date under purchase accounting. + References No definition available. + Details
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- Definition Amount of increase (decrease) in amortization from adjustments after acquisition date under purchase accounting. + References No definition available. + Details
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- Definition Represents the amount of increase (decrease) in the provisional purchase price allocation for a business acquisition. + References No definition available. + Details
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- Definition Represents the amount held back and disbursed in a business combination. + References No definition available. + Details
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- Definition Represents the amount held back as required consent holdback in a business combination. + References No definition available. + Details
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- Definition Amount of increase (decrease) in depreciation from adjustments after acquisition date under purchase accounting. + References No definition available. + Details
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- Definition Amount of increase (decrease) in net loss from adjustments after acquisition date under purchase accounting. + References No definition available. + Details
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- Definition Represents the remaining ownership interest percentage that seller has the option but not the obligation to sell. + References No definition available. + Details
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- Definition The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer. Related to an acquisition. + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + 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 (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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- Definition Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 + 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=84161108&loc=SL65897772-128472 + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to intangibles acquired 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=84161108&loc=SL65897772-128472 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the 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 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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