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Note 6 - Business Acquisitions (Details Textual) - USD ($) |  |  |  |  |  |  |  |  |  |  | 9 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 | Sep. 30, 2018 | Sep. 30, 2017
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  |  |  |  |  |  |  |  |  | $ 135,023,950 | $ 10,586,890
Repayments of Short-term Debt Related to Acquisition |  |  |  |  |  |  |  |  |  |  | $ 427,500 |
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 |
Tammy Lynn Outdoor, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Total |  |  | $ 16,688,254 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total |  |  |  |  |  |  |  |  |  |  | $ 16,688,254 |
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 |
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 |  |  |  |  |  |  |  |  |  |
Waitt Outdoor, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total | $ 82,000,000 |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  |  |  |  |  |  |  | 314,000 |
Amortization, Purchase Accounting Adjustments |  |  |  |  |  |  |  |  |  |  | (64,965) |
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 |  |  |  |  |  |
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 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 |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  | $ 223,500 |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  | 100.00% |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  |  |  | $ 69,500 |  |  |  |  |  |  |  |

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