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Note 2 - Summary of Significant Accounting Policies (Details Textual)
 12 Months Ended
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)  
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