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Note 3 - Summary of Significant Accounting Policies (As Restated) (Details Textual) |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 26, 2020 shares | Oct. 01, 2020 USD ($) | Oct. 01, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($)
Accounts Receivable, Allowance for Credit Loss, Current |  |  |  | $ 328,522 | $ 127,635 |  |
Number of Reporting Units |  |  |  | 4 |  |  |
Goodwill, Impairment Loss |  | $ 0 | $ 0 |  |  |  |
Goodwill, Ending Balance |  |  |  | $ 124,446,446 | 106,272,501 |  |
Ceded Premiums Earned |  |  |  | 595,750 | 726,764 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total |  |  |  | 0 | 0 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total |  |  |  | 0 | 0 |  |
Operating Lease, Liability, Total |  |  |  | 51,936,597 | 52,001,379 |  |
Finite-Lived Intangible Assets, Net, Ending Balance |  |  |  | 39,866,820 |  |  |
Off-Market Favorable Lease [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Ending Balance |  |  |  |  |  |  | $ 811,709
Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |
Operating Lease, Liability, Total |  |  |  |  |  | $ 49,066,289 |
Prepaid Land Lease Assets |  |  |  |  |  | (1,945,820) |
Accrued Rent |  |  |  |  |  | $ (1,316,000) |
Yellowstone Acquisition Company [Member] | Common Class A [Member] | IPO [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | shares | 13,598,898 |  |  |  |  |  |
Tammy Lynn Outdoor, LLC, Key Outdoor, Inc and Waitt Outdoor, LLC [Member] |  |  |  |  |  |  |
Goodwill, Ending Balance |  |  |  | $ 18,150,000 | 3,500,000 |  |
Minimum [Member] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  | 4 years |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  | 2 years |  |  |
Lessor, Operating Lease, Term of Contract (Month) |  |  |  | 1 month |  |  |
Maximum [Member] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  | 20 years |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  | 50 years |  |  |
Lessor, Operating Lease, Term of Contract (Month) |  |  |  | 3 years |  |  |
Billboard Rentals [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss, Current |  |  |  | $ 217,871 | 127,635 |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  | 28,260,964 | 28,429,167 |  |
Broadband Services [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss, Current |  |  |  | 110,651 |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  | 3,836,537 | 0 |  |
Production Services [Member] |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  | $ 1,373,339 | $ 1,341,995 |  |

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