Document And Entity Information - USD ($)	12 Months Ended
Document And Entity Information - USD ($)	Dec. 31, 2025	Apr. 21, 2026	Jun. 30, 2025
Document Information [Line Items]
Document Type	10-K/A
Document Annual Report	true
Document Period End Date	Dec. 31, 2025
Document Transition Report	false
Entity File Number	001-38113
Entity Registrant Name	BOSTON OMAHA CORPORATION
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	false
Entity Emerging Growth Company	false
Entity Shell Company	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Public Float			$ 339,121,697
Amendment Description	This Amendment No. 1 on Form 10-K/A (the “Amendment”) amends the Annual Report on Form 10-K (the “Original Form 10-K”) of Boston Omaha Corporation (the “Company”) for the fiscal year ended December 31, 2025 (the “2025 Fiscal Year”), as filed with the Securities and Exchange Commission (the “SEC”) on March 30, 2026. We are filing this Amendment to amend Part III of the Original Form 10-K to include the information required by and not included in Part III of the Original Form 10-K because we do not intend to file an annual meeting definitive proxy statement within 120 days of December 31, 2025.
Entity Central Index Key	0001494582
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	FY
Amendment Flag	true
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		29,956,651
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		580,558

BOSTON OMAHA Corp 10-K/A