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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2023
Apr. 26, 2024
Jun. 30, 2023
Document Information [Line Items]      
Entity, Registrant Name BOSTON OMAHA CORPORATION    
Current Fiscal Year End Date --12-31    
Document, Fiscal Period Focus FY    
Document, Fiscal Year Focus 2023    
Document, Type 10-K/A    
Document, Annual Report true    
Document, Period End Date Dec. 31, 2023    
Document, Transition Report false    
Entity, File Number 001-38113    
Entity, Incorporation, State or Country Code DE    
Entity, Tax Identification Number 27-0788438    
Entity, Address, Address Line One 1601 Dodge Street, Suite 3300    
Entity, Address, City or Town Omaha    
Entity, Address, State or Province NE    
Entity, Address, Postal Zip Code 68102    
City Area Code 857    
Local Phone Number 256-0079    
Title of 12(b) Security Class A common stock, $0.001 par value per share    
Trading Symbol BOC    
Security Exchange Name NYSE    
Entity, Well-known Seasoned Issuer No    
Entity, Voluntary Filers No    
Entity, Current Reporting Status Yes    
Entity, Interactive Data, Current Yes    
Entity, Filer Category Non-accelerated Filer    
Entity, Small Business true    
Entity, Emerging Growth Company false    
Entity, Shell Company false    
ICFR Auditor Attestation Flag false    
Document, Financial Statement Error Correction Flag true    
Document, Financial Statement Restatement Recovery Analysis Flag false    
Entity, Public Float     $ 440,664,052
Auditor Name KPMG LLP    
Auditor Location Omaha, Nebraska    
Auditor Firm ID 185    
Amendment Description This Amendment No. 1 on Form 10-K/A (the “Amendment”) amends the Annual Report on Form 10-K (the “2023 Form 10-K”) of Boston Omaha Corporation (the “Company”) for the fiscal year ended December 31, 2023 (the “2023 Fiscal Year”), as filed with the Securities and Exchange Commission (the “SEC”) on March 27, 2024. We are filing this Amendment to amend Part III of the 2023 Form 10-K to include the information required by and not included in Part III of the 2023 Form 10-K because we do not intend to file an annual meeting definitive proxy statement within 120 days of the end of December 31, 2023.   In addition, the Exhibit Index in Item 15 of Part IV of the 2023 Form 10-K is hereby amended and restated in its entirety and currently dated certifications required under Section 302 of the Sarbanes-Oxley Act of 2002 are filed as exhibits to this Amendment. Because no financial statements are contained within this Amendment, we are not filing currently dated certifications pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 nor are we filing a consent of our independent public accounting firm.   Except as described above, no other changes have been made to the 2023 Form 10-K. The 2023 Form 10-K continues to speak as of the date of the 2023 Form 10-K, and we have not updated the disclosures contained therein to reflect any events which occurred at a date subsequent to the filing of the 2023 Form 10-K other than as expressly indicated in this Amendment.    
Amendment Flag true    
Entity, Central Index Key 0001494582    
Common Class A [Member]      
Document Information [Line Items]      
Entity, Common Stock Shares, Outstanding   31,138,769  
Common Class B [Member]      
Document Information [Line Items]      
Entity, Common Stock Shares, Outstanding   1,055,560