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Note 2 - Summary of Significant Accounting Policies (Details Textual)
 12 Months Ended
Oct. 01, 2022
USD ($)
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
$ / shares
May 01, 2023
Assets   $ 768,207,092 $ 687,802,899  
Liabilities   $ 151,754,831 158,059,668  
Number of Reporting Units   4    
Goodwill, Impairment Loss $ 0      
Goodwill   $ 182,380,136 179,463,522  
Ceded Premiums Earned   3,302,753 1,230,505  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total   0    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total   0    
Deferred Income Tax Liabilities, Net   12,111,812 14,939,607  
Retained Earnings (Accumulated Deficit)   15,669,488 22,673,497  
Equity, Attributable to Parent   538,207,426 506,621,142  
Net Income (Loss) Attributable to Parent   $ (7,004,009) $ 10,233,400  
Earnings Per Share, Basic (in dollars per share) | $ / shares   $ (0.23) $ 0.34  
Revision of Prior Period, Adjustment [Member]        
Assets     $ 4,085,040  
Liabilities     991,188  
Equity Method Investments     4,085,040  
Deferred Income Tax Liabilities, Net     991,188  
Retained Earnings (Accumulated Deficit)     3,093,852  
Equity, Attributable to Parent     3,093,852  
Equity Method Investment, Underlying Equity in Net Assets     4,085,040  
Net Income (Loss) Attributable to Parent     $ 3,093,852  
Earnings Per Share, Basic (in dollars per share) | $ / shares     $ 0.1  
Tammy Lynn Outdoor, LLC, Key Outdoor, Inc and Waitt Outdoor, LLC [Member]        
Goodwill   $ 2,900,000 $ 26,100,000  
The 24th Street Asset Management, LLC [Member] | Boston Omaha Asset Management, LLC [Member]        
Business Acquisition, Percentage of Voting Interests Acquired       100.00%
Minimum [Member]        
Property, Plant and Equipment, Useful Life (Year)   4 years    
Finite-Lived Intangible Asset, Useful Life (Year)   5 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    
Variable Interest Entity, Primary Beneficiary [Member]        
Assets   $ 96,500,000 21,900,000  
Liabilities   $ 132,000 $ 31,000