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Note 18 - Subsequent Events (Details Textual) - USD ($)	1 Months Ended		3 Months Ended
	May 14, 2025	Apr. 30, 2025	Mar. 31, 2025	Mar. 31, 2024
Proceeds from Long-Term Lines of Credit			$ 3,500,000	$ 0
Subsequent Event [Member] | First National Bank of Omaha [Member] | Credit Facility [Member] | Boston Omaha Broadband Credit Facility [Member]
Proceeds from Long-Term Lines of Credit		$ 4,000,000
Sky Harbour Group Corporation [Member] | Subsequent Event [Member]
Investment Owned, Shares Sold (in shares)	335,656
Proceeds from Sale of Investments	$ 3,800,000

X

- Definition

The number of shares sold of investment.

+ References

No definition available.

+ Details

Name:	boc_InvestmentOwnedSharesSold
Namespace Prefix:	boc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash inflow from sale of investments.

+ References

No definition available.

+ Details

Name:	boc_ProceedsFromSaleOfInvestments
Namespace Prefix:	boc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-14

+ Details

Name:	us-gaap_ProceedsFromLongTermLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=boc_FirstNationalBankOfOmahaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=boc_CreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=boc_BostonOmahaBroadbandCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_OwnershipAxis=boc_SkyHarbourGroupCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: