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Note 6 - Business Acquisitions (Details Textual) - USD ($)
 12 Months Ended
Oct. 01, 2019
Aug. 30, 2019
Aug. 31, 2018
Aug. 22, 2018
Jul. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Payments to Acquire Businesses, Net of Cash Acquired, Total           $ 7,473,891 $ 134,798,950
Goodwill, Ending Balance           106,272,501 98,685,795
Payments to Acquire Property, Plant, and Equipment, Total           $ 2,812,228 3,120,951
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  
Bilboards in Missouri [Member]              
Business Combination, Amount Held Back and Disbursed $ 380,546            
Payments to Acquire Property, Plant, and Equipment, Total $ 1,337,685            
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, Consideration Transferred, Total   $ 7,625,604          
Business Combination, Amount Held Back and Disbursed   398,750          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total   1,544,970          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total   3,152,000          
Goodwill, Ending Balance   3,058,633          
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, Consideration Transferred, Total         $ 16,463,254    
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual             853,018
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual             210,647
Business Combination, Acquisition Related Costs             170,856
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 9,603,838
Goodwill, Ending Balance           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             1,947,895
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual             (418,705)
Business Combination, Acquisition Related Costs             177,658
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 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  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Depreciation           (193,269)  
Waitt Outdoor, LLC [Member]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total           16,220,375 19,723,904
Goodwill, Ending Balance           48,650,475 46,381,946
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other           1,316,000 1,316,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual             4,468,421
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual             (93,469)
Business Combination, Acquisition Related Costs             195,325
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        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Amortization           459,369  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Depreciation           $ (253,033)  
Other Restricted Assets, Noncurrent     $ 4,102,500