Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2022
Accounting Policies [Abstract]
Consolidation, Policy [Policy Text Block]	Consolidation Policy The financial statements of Boston Omaha Corporation include the accounts of the Company and our consolidated subsidiaries, which are comprised of voting interest entities in which we have a controlling financial interest and variable interest entities in which we are the primary beneficiary in accordance with ASC 810, Consolidation. The equity attributable to non-controlling interests in subsidiaries is shown separately in the accompanying consolidated balance sheets. All significant intercompany profits, losses, transactions and balances have been eliminated in consolidation. Our consolidated subsidiaries at June 30, 2022 include: Link Media Holdings, LLC which we refer to as “LMH” Link Media Alabama, LLC which we refer to as “LMA” Link Media Florida, LLC which we refer to as “LMF” Link Media Wisconsin, LLC which we refer to as “LMW” Link Media Georgia, LLC which we refer to as “LMG” Link Media Midwest, LLC which we refer to as “LMM” Link Media Omaha, LLC which we refer to as “LMO” Link Media Properties, LLC which we refer to as “LMP” Link Media Southeast, LLC which we refer to as “LMSE” Link Media Services, LLC which we refer to as “LMS” Link Billboards Oklahoma, LLC which we refer to as "LBO" General Indemnity Group, LLC which we refer to as “GIG” American Contracting Services, Inc. which we refer to as "ACS" The Warnock Agency, Inc. which we refer to as “Warnock” United Casualty and Surety Insurance Company which we refer to as “UCS” Surety Support Services, Inc. which we refer to as “SSS” South Coast Surety Insurance Services, LLC which we refer to as “SCS” Boston Omaha Investments, LLC which we refer to as “BOIC” Boston Omaha Asset Management, LLC which we refer to as “BOAM” BOAM BFR LLC which we refer to as "BOAM BFR" BOC DFH, LLC which we refer to as “BOC DFH” BOC OPS LLC which we refer to as "BOC OPS" BOC Yellowstone LLC which we refer to as "BOC Yellowstone" BOC Yellowstone II LLC which we refer to as “BOC Yellowstone II” BOC YAC Funding LLC which we refer to as "BOC YAC" Fiber is Fast, LLC which we refer to as "FIF" FIF AireBeam LLC which we refer to as “AireBeam” Fiber Fast Homes, LLC which we refer to as "FFH" FIF Utah LLC which we refer to as “FIF Utah” FIF St George, LLC which we refer to as "FIF St George"
Reclassification, Comparability Adjustment [Policy Text Block]	Reclassifications Certain accounts in the prior year financial statements have been reclassified for comparative purposes to conform to the presentation in the current year financial statements.
Revenue [Policy Text Block]	Revenues The majority of our advertising revenues are derived from contracts for advertising space on billboard structures and are accounted for under Financial Accounting Standards Board, which we refer to as the “FASB,” Accounting Standards Codification, which we refer to as “ASC,” 606, Revenue from Contracts with Customers. Premium revenues derived from our insurance operations are subject to ASC 944, Financial Services – Insurance. Revenue Recognition Billboard Rentals We generate revenue from outdoor advertising through the leasing of advertising space on billboards. The terms of the contracts range from less than one month to three years and are generally billed monthly. Revenue for advertising space rental is recognized on a straight-line basis over the term of the contract. Advertising revenue is reported net of agency commissions. Agency commissions are calculated based on a stated percentage applied to gross billing revenue for operations. Payments received in advance of being earned are recorded as deferred revenue. Another component of billboard rentals consists of production services which include creating and printing advertising copy. Contract revenues for production services are accounted for under ASC 606, Revenue from Contracts with Customers. Revenues are recognized at a point in time upon satisfaction of the contract, which is typically less than one week. Deferred Revenues We record deferred revenues when cash payments are received in advance of being earned or when we have an unconditional right to consideration before satisfying our performance obligation. The term between invoicing and when a payment is due is not significant. For certain services we require payment before the product or services are delivered to the customer. The balance of deferred revenue is considered short-term and will be recognized in revenue within twelve months. Premiums and Unearned Premium Reserves Premiums written are recognized as revenues based on a pro-rata daily calculation over the respective terms of the policies in-force. The cost of reinsurance ceded is initially written as prepaid reinsurance premiums and is amortized over the reinsurance contract period in proportion to the amount of insurance protection provided. Premiums ceded of $559,587 and $329,268 for the six months ended June 30, 2022 and 2021, respectively, are included within “Premiums earned” in our consolidated statements of operations. Commissions We generate revenue from commissions on surety bond sales and account for commissions under ASC 606. Insurance commissions are earned from various insurance companies based upon our agency agreements with them. We arrange with various insurance companies for the provision of a surety bond for entities that require a surety bond. The insurance company sets the price of the bond. The contract with the insurance company is fulfilled when the bond is issued by the insurance agency on behalf of the insurance company. The insurance commissions are calculated based upon a stated percentage applied to the gross premiums on bonds. Commissions are recognized at a point in time, on a bond-by-bond basis as of the policy effective date and are generally nonrefundable. Broadband Revenues Broadband revenue is derived principally from internet services and is recognized on a straight-line basis over the term of the contract in the period the services are rendered. Revenue received or receivable in advance of the delivery of services is included in deferred revenue.
Liability Reserve Estimate, Policy [Policy Text Block]	Loss and Loss Adjustment Expenses Unpaid losses and loss adjustment expenses represent estimates for the ultimate cost of unpaid reported and unreported claims incurred and related expenses. Estimates for losses and loss adjustment expenses are based on past experience of investigating and adjusting claims and consideration of the level of premiums written during the current and prior year. Since the reserves are based on estimates, the ultimate liability may differ from the estimated reserve. The effects of changes in estimated reserves are included within cost of insurance revenues in our results of operations in the period in which the estimates are updated. The reserves are included within accounts payable and accrued expenses in our consolidated balance sheets.
Consolidation, Variable Interest Entity, Policy [Policy Text Block]	Variable Interest Entities (VIEs) We determine whether an entity is a VIE and, if so, whether it should be consolidated by utilizing judgments and estimates that are inherently subjective. Our determination of whether an entity in which we hold a direct or indirect variable interest is a VIE is based on several factors, including whether the entity’s total equity investment at risk upon inception is sufficient to finance the entity’s activities without additional subordinated financial support. We make judgments regarding the sufficiency of the equity at risk based first on a qualitative analysis, and then a quantitative analysis, if necessary. We analyze any investments in VIEs to determine if we are the primary beneficiary. In evaluating whether we are the primary beneficiary, we evaluate our direct and indirect economic interests in the entity. A reporting entity is determined to be the primary beneficiary if it holds a controlling financial interest in the VIE. Determining which reporting entity, if any, has a controlling financial interest in a VIE is primarily a qualitative approach focused on identifying which reporting entity has both: (i) the power to direct the activities of a VIE that most significantly impact such entity’s economic performance; and (ii) the obligation to absorb losses or the right to receive benefits from such entity that could potentially be significant to such entity. Performance of that analysis requires the exercise of judgment. We consider a variety of factors in identifying the entity that holds the power to direct matters that most significantly impact the VIE’s economic performance including, but not limited to, the ability to direct operating decisions and activities. In addition, we consider the rights of other investors to participate in those decisions. We determine whether we are the primary beneficiary of a VIE at the time we become involved with a variable interest entity and reconsider that conclusion continually. We consolidate any VIE of which we are the primary beneficiary.
Income Tax, Policy [Policy Text Block]	Income Taxes We compute our year-to-date provision for income taxes by applying the estimated annual effective tax rate to year-to-date pre-tax income or loss and adjust the provision for discrete tax items recorded in the period. The realization of deferred tax assets, including net operating loss carryforwards, is dependent on the generation of future taxable income sufficient to realize the tax deductions, carryforwards and credits. Valuation allowances on deferred tax assets are recognized if it is determined that it is more likely than not that the asset will not be realized. During the year ended December 31, 2021, we reversed the overall valuation allowance previously recorded against our net deferred tax asset and recorded a valuation allowance against certain deferred tax assets that we have determined are not more-likely-than-not realizable. Pursuant to Section 382 of the Internal Revenue Code of 1986, as amended, annual use of our net operating losses may be limited if it is determined that an ownership shift has occurred. An ownership shift is generally defined as a cumulative change in equity ownership by ‘‘5% shareholders’’ that exceeds 50 percentage points over a rolling three-year period. At this time, a Section 382 study has not been performed to determine if such an ownership shift has occurred.

Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2022

Consolidation, Policy [Policy Text Block]

Consolidation Policy

The financial statements of Boston Omaha Corporation include the accounts of the Company and our consolidated subsidiaries, which are comprised of voting interest entities in which we have a controlling financial interest and variable interest entities in which we are the primary beneficiary in accordance with ASC 810, Consolidation. The equity attributable to non-controlling interests in subsidiaries is shown separately in the accompanying consolidated balance sheets. All significant intercompany profits, losses, transactions and balances have been eliminated in consolidation.

Our consolidated subsidiaries at June 30, 2022 include:

Link Media Holdings, LLC which we refer to as “LMH”

Link Media Alabama, LLC which we refer to as “LMA”

Link Media Florida, LLC which we refer to as “LMF”

Link Media Wisconsin, LLC which we refer to as “LMW”

Link Media Georgia, LLC which we refer to as “LMG”

Link Media Midwest, LLC which we refer to as “LMM”

Link Media Omaha, LLC which we refer to as “LMO”

Link Media Properties, LLC which we refer to as “LMP”

Link Media Southeast, LLC which we refer to as “LMSE”

Link Media Services, LLC which we refer to as “LMS”

Link Billboards Oklahoma, LLC which we refer to as "LBO"

General Indemnity Group, LLC which we refer to as “GIG”

American Contracting Services, Inc. which we refer to as "ACS"

The Warnock Agency, Inc. which we refer to as “Warnock”

United Casualty and Surety Insurance Company which we refer to as “UCS”

Surety Support Services, Inc. which we refer to as “SSS”

South Coast Surety Insurance Services, LLC which we refer to as “SCS”

Boston Omaha Investments, LLC which we refer to as “BOIC”

Boston Omaha Asset Management, LLC which we refer to as “BOAM”

BOAM BFR LLC which we refer to as "BOAM BFR"

BOC DFH, LLC which we refer to as “BOC DFH”

BOC OPS LLC which we refer to as "BOC OPS"

BOC Yellowstone LLC which we refer to as "BOC Yellowstone"

BOC Yellowstone II LLC which we refer to as “BOC Yellowstone II”

BOC YAC Funding LLC which we refer to as "BOC YAC"

Fiber is Fast, LLC which we refer to as "FIF"

FIF AireBeam LLC which we refer to as “AireBeam”

Fiber Fast Homes, LLC which we refer to as "FFH"

FIF Utah LLC which we refer to as “FIF Utah”

FIF St George, LLC which we refer to as "FIF St George"

Reclassification, Comparability Adjustment [Policy Text Block]

Reclassifications

Certain accounts in the prior year financial statements have been reclassified for comparative purposes to conform to the presentation in the current year financial statements.

Revenue [Policy Text Block]

Revenues

The majority of our advertising revenues are derived from contracts for advertising space on billboard structures and are accounted for under Financial Accounting Standards Board, which we refer to as the “FASB,” Accounting Standards Codification, which we refer to as “ASC,” 606, Revenue from Contracts with Customers.

Premium revenues derived from our insurance operations are subject to ASC 944, Financial Services – Insurance.

Revenue Recognition

Billboard Rentals

We generate revenue from outdoor advertising through the leasing of advertising space on billboards. The terms of the contracts range from less than one month to three years and are generally billed monthly. Revenue for advertising space rental is recognized on a straight-line basis over the term of the contract. Advertising revenue is reported net of agency commissions. Agency commissions are calculated based on a stated percentage applied to gross billing revenue for operations. Payments received in advance of being earned are recorded as deferred revenue.

Another component of billboard rentals consists of production services which include creating and printing advertising copy. Contract revenues for production services are accounted for under ASC 606, Revenue from Contracts with Customers. Revenues are recognized at a point in time upon satisfaction of the contract, which is typically less than one week.

Deferred Revenues

We record deferred revenues when cash payments are received in advance of being earned or when we have an unconditional right to consideration before satisfying our performance obligation. The term between invoicing and when a payment is due is not significant. For certain services we require payment before the product or services are delivered to the customer. The balance of deferred revenue is considered short-term and will be recognized in revenue within twelve months.

Premiums and Unearned Premium Reserves

Premiums written are recognized as revenues based on a pro-rata daily calculation over the respective terms of the policies in-force. The cost of reinsurance ceded is initially written as prepaid reinsurance premiums and is amortized over the reinsurance contract period in proportion to the amount of insurance protection provided. Premiums ceded of $559,587 and $329,268 for the six months ended June 30, 2022 and 2021, respectively, are included within “Premiums earned” in our consolidated statements of operations.

Commissions

We generate revenue from commissions on surety bond sales and account for commissions under ASC 606. Insurance commissions are earned from various insurance companies based upon our agency agreements with them. We arrange with various insurance companies for the provision of a surety bond for entities that require a surety bond. The insurance company sets the price of the bond. The contract with the insurance company is fulfilled when the bond is issued by the insurance agency on behalf of the insurance company. The insurance commissions are calculated based upon a stated percentage applied to the gross premiums on bonds. Commissions are recognized at a point in time, on a bond-by-bond basis as of the policy effective date and are generally nonrefundable.

Broadband Revenues

Broadband revenue is derived principally from internet services and is recognized on a straight-line basis over the term of the contract in the period the services are rendered. Revenue received or receivable in advance of the delivery of services is included in deferred revenue.

Liability Reserve Estimate, Policy [Policy Text Block]

Loss and Loss Adjustment Expenses

Unpaid losses and loss adjustment expenses represent estimates for the ultimate cost of unpaid reported and unreported claims incurred and related expenses. Estimates for losses and loss adjustment expenses are based on past experience of investigating and adjusting claims and consideration of the level of premiums written during the current and prior year. Since the reserves are based on estimates, the ultimate liability may differ from the estimated reserve. The effects of changes in estimated reserves are included within cost of insurance revenues in our results of operations in the period in which the estimates are updated. The reserves are included within accounts payable and accrued expenses in our consolidated balance sheets.

Consolidation, Variable Interest Entity, Policy [Policy Text Block]

Variable Interest Entities (VIEs)

We determine whether an entity is a VIE and, if so, whether it should be consolidated by utilizing judgments and estimates that are inherently subjective. Our determination of whether an entity in which we hold a direct or indirect variable interest is a VIE is based on several factors, including whether the entity’s total equity investment at risk upon inception is sufficient to finance the entity’s activities without additional subordinated financial support. We make judgments regarding the sufficiency of the equity at risk based first on a qualitative analysis, and then a quantitative analysis, if necessary.

We analyze any investments in VIEs to determine if we are the primary beneficiary. In evaluating whether we are the primary beneficiary, we evaluate our direct and indirect economic interests in the entity. A reporting entity is determined to be the primary beneficiary if it holds a controlling financial interest in the VIE. Determining which reporting entity, if any, has a controlling financial interest in a VIE is primarily a qualitative approach focused on identifying which reporting entity has both: (i) the power to direct the activities of a VIE that most significantly impact such entity’s economic performance; and (ii) the obligation to absorb losses or the right to receive benefits from such entity that could potentially be significant to such entity. Performance of that analysis requires the exercise of judgment.

We consider a variety of factors in identifying the entity that holds the power to direct matters that most significantly impact the VIE’s economic performance including, but not limited to, the ability to direct operating decisions and activities. In addition, we consider the rights of other investors to participate in those decisions. We determine whether we are the primary beneficiary of a VIE at the time we become involved with a variable interest entity and reconsider that conclusion continually. We consolidate any VIE of which we are the primary beneficiary.

Income Tax, Policy [Policy Text Block]

Income Taxes

We compute our year-to-date provision for income taxes by applying the estimated annual effective tax rate to year-to-date pre-tax income or loss and adjust the provision for discrete tax items recorded in the period.

The realization of deferred tax assets, including net operating loss carryforwards, is dependent on the generation of future taxable income sufficient to realize the tax deductions, carryforwards and credits. Valuation allowances on deferred tax assets are recognized if it is determined that it is more likely than not that the asset will not be realized. During the year ended December 31, 2021, we reversed the overall valuation allowance previously recorded against our net deferred tax asset and recorded a valuation allowance against certain deferred tax assets that we have determined are not more-likely-than-not realizable.

Pursuant to Section 382 of the Internal Revenue Code of 1986, as amended, annual use of our net operating losses may be limited if it is determined that an ownership shift has occurred. An ownership shift is generally defined as a cumulative change in equity ownership by ‘‘5% shareholders’’ that exceeds 50 percentage points over a rolling three-year period. At this time, a Section 382 study has not been performed to determine if such an ownership shift has occurred.

- Definition

Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.

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