Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2026
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	*Basis of Presentation* The accompanying unaudited consolidated financial statements and the related notes (the “Financial Statements”) have been prepared in conformity with the U.S. Securities and Exchange Commission (the “SEC”) requirements for quarterly reports on Form 10-Q, and consequently exclude certain disclosures normally included in audited consolidated financial statements prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). These Financial Statements include the accounts of SHG and its consolidated subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The Financial Statements should be read in conjunction with the audited consolidated financial statements and the notes contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025, which includes additional disclosures and a summary of the Company's significant accounting policies. In the Company’s opinion, these Financial Statements include all adjustments, consisting of normal recurring items, considered necessary by management to fairly state the Company’s results of operation, financial position, and cash flows. Certain historical amounts have been reclassified to conform to the current year’s presentation.
Use of Estimates, Policy [Policy Text Block]	*Use of Estimates* The preparation of consolidated financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting periods. Such estimates include assumptions used within impairment analyses, estimated useful lives of depreciable assets and amortizable costs, estimates of inputs utilized in determining the fair value of financial instruments such as warrants, and estimates and assumptions related to right-of-use assets and operating lease liabilities. Actual results could differ materially from those estimates.
Risks and Uncertainties [Policy Text Block]	*Risks and Uncertainties* The Company is subject to risks and uncertainties common to early-stage companies. For most of its history, the Company has been engaged in securing access to land through ground leases and developing and constructing aviation hangars. The major risks faced by the Company are its future ability to obtain additional tenants for the facilities that it constructs, and to contract with such tenants for rental income in an amount that is sufficient to meet the Company’s financial obligations, including increasing construction costs due to inflation and increased borrowing costs to the extent that the Company incurs additional indebtedness.
Liquidity and Capital Resources [Policy Text Block]	*Liquidity and Capital Resources* As a result of ongoing construction projects and business development activities, including the development of aircraft hangars and the leasing of available hangar space, the Company has incurred recurring losses and negative cash flows from operating activities since its inception. The Company expects to continue to invest in such activities and generate operating losses in the near future. The Company obtained long-term financing through bond and equity offerings, committed bank drawdown facility, and has the ability to utilize its at-the-market offering program to fund its construction, lease, and operational commitments, and believes its liquidity is sufficient to allow continued operations for more than one year after the date these financial statements are issued.
Consolidation, Policy [Policy Text Block]	Basis of Consolidation SHG is deemed to have a controlling interest of Sky through its appointment as the managing member of Sky, in which SHG has control over the affairs and decision-making of Sky. The interests in Sky not owned by the Company are presented as non-controlling interests. Sky’s ownership percentage in each of its consolidated subsidiaries is 100%, unless otherwise disclosed.
Cost of Construction [Policy Text Block]	Cost of Construction Cost of construction on the accompanying consolidated balance sheets is carried at cost. The cost of acquiring an asset includes the costs necessary to bring a capital project to the condition necessary for its intended use. Costs are capitalized once the construction of a specific capital project is probable. Construction labor and other direct costs of construction are capitalized. Professional fees for engineering, procurement, consulting, and other soft costs that are directly identifiable with the project and are considered an incremental direct cost are capitalized. Activities associated with internally manufactured hangar buildings, including materials, direct manufacturing labor, and manufacturing overhead directly identifiable with such activities are allocated to our construction projects and capitalized. The Company allocates a portion of its internal salaries to both capitalized cost of construction and to general and administrative expense based on the percentage of time certain employees worked in the related areas. Interest, net of the amortization of debt issuance costs and premiums, and net of interest income earned on bond proceeds, is also capitalized until the capital projects are completed. Once a capital project is complete, the Company begins to depreciate the constructed asset on a straight-line basis over the lesser of the estimated useful life of the asset or the remaining term of the related ground lease, including expected renewal terms.
Lessee, Leases [Policy Text Block]	Leases The Company accounts for leases under Accounting Standards Codification (“ASC”) Topic 842, Leases. The Company determines whether a contract contains a lease at the inception of the contract. ASC Topic 842 requires lessees to recognize lease liabilities and right-of-use (“ROU”) assets for all operating leases with terms of more than 12 months on the consolidated balance sheets. The Company has made an accounting policy election to not recognize leases with an initial term of 12 months or less on the Company’s consolidated balance sheets and will recognize those lease payments in the consolidated statements of operations on a straight-line basis over the lease term. When management determines that it is reasonably certain that the Company will exercise its options to renew the leases, the renewal terms are included in the lease term and the resulting ROU asset and lease liability balances. The Company has lease agreements with lease and non-lease components; the Company has elected the accounting policy to not separate lease and non-lease components for all underlying asset classes. The Company has not elected to capitalize any interest cost that is implicit within its operating leases into cost of construction on the consolidated balance sheet, but instead, expenses its ground lease cost as a component of operating expenses in the consolidated statements of operations. All of the Company’s ground leases at airports are classified as operating leases under ASC Topic 842. Management has determined that it is reasonably certain that the Company will exercise its options to renew the leases, and therefore the renewal options are included in the lease term and the resulting ROU asset and operating lease liability balances. As the Company’s lease agreements do not provide a readily determinable implicit rate, nor is the rate available to the Company from its lessors, the Company uses its incremental borrowing rate to determine the present value of the lease payments. The Company has operating leases that contain variable payments, most commonly in the form of common area maintenance and operating expense charges, which are based on actual costs incurred. These variable payments were excluded from the calculation of the ROU asset and operating lease liability balances since they are not fixed or in-substance fixed payments. These variable payments were not material in amount for the three and six months ended June 30, 2026 and 2025. Some of the leases contain covenants that require the Company to construct the hangar facilities on the leased grounds within a certain period and spend a set minimum dollar amount. For one of the leases, the shortfall (if any) must be paid to the lessor. See Note 18 — Commitments and Contingencies.
Derivatives, Policy [Policy Text Block]	Warrants liability The Company accounts for its Warrants (as defined in Note 11 — Warrants) in accordance with the guidance contained in ASC Topic 815, “Derivatives and Hedging” (“ASC 815”), under which warrants that do not meet the criteria for equity classification and must be recorded as derivative liabilities. Accordingly, the Company classifies the Warrants as liabilities carried at their fair value and adjusts the warrants to fair value at each reporting period. This liability is subject to re-measurement at each balance sheet date until the warrants are exercised or expire, and any change in fair value is recognized in the consolidated statement of operations.
Revenue [Policy Text Block]	Revenue recognition The Company leases the hangar facilities that it constructs to third parties. The Company determines whether a contract contains a lease at the inception of the contract. The lease agreements are either on a month-to-month basis or have a defined term and may have options to extend the term. Some of the leases contain options to terminate the lease by either party with given notice. The Company expects to continue to derive benefit from the underlying assets after the end of the lease term through further leasing arrangements. The underlying assets are the leasehold interest that the Company has in connection with its ground leases. There are no options given to the lessee to purchase the underlying assets. Rental revenue is recognized in accordance with ASC 842 and includes fixed payments of cash rents, which represents revenue each tenant pays in accordance with the terms of its respective lease and is recognized on a straight-line basis over the term of the lease. Rental revenue and the corresponding rent and other receivables are recorded net of any concessions and uncollectible tenant receivables, if any, for all periods presented. The Company evaluates the collectability of tenant receivables for payments required under the lease agreements. If the Company determines that collectability is not probable, the Company recognizes any difference between revenue amounts recognized to date under ASC 842 and payments that have been collected from the lessee, including any additional rent or lease termination fees, as a current period adjustment to rental revenue. At certain of the Company’s hangar campuses, the Company recognizes revenue from ground-based services, such as the fueling and towing of aircraft under ASC Topic 606, Revenue from Contracts with Customers. Revenue for the sale of aircraft fuel is recognized at the time customer obtains control of the fuel. Revenue for the sale of other ground-based services is recognized at the time the service is performed and provided to customers. Customers are invoiced at the time the services are performed and the associated revenue is recognized in the period it is earned. The Company’s fueling arrangements generally are unique at each location it operates, and may be accounted for on a gross or net basis. The Company determines whether to recognize fuel and services revenue on a gross or net basis based on consideration of various factors, including whether the Company has control of the products or services prior to delivery to customers, the Company’s degree of latitude in establishing the sales price, whether the Company carries the associated inventory risk, and which party is the primary obligor within such sales arrangements. For the three and six months ended June 30, 2026 and 2025, the Company did not derive 10% of its revenue from any single tenant.
Income Tax, Policy [Policy Text Block]	Income Taxes SHG is classified as a corporation for U.S. Federal income tax purposes and is subject to U.S. Federal and state income taxes. SHG includes in income, for U.S. Federal income tax purposes, its allocable portion of income from the “pass-through” entities in which it holds an interest, including Sky. The “pass-through” entities are not subject to U.S. Federal and certain state income taxes at the entity level, and instead, the tax liabilities with respect to taxable income are passed through to the members, including SHG. As a result, prior to the transactions contemplated by that certain Equity Purchase Agreement, dated as of August 1, 2021, by and among Yellowstone Acquisition Company (“YAC”) and Sky, which we refer to as the Yellowstone Transaction, Sky was not subject to U.S. Federal and certain state income taxes at the entity level. The Company follows the asset and liability method of accounting for income taxes. This method gives consideration to the future tax consequences associated with the differences between the financial accounting and tax basis of the assets and liabilities as well as the ultimate realization of any deferred tax asset resulting from such differences, as well as from net operating losses and other tax-basis carryforwards. Valuation allowances are recorded to reduce deferred tax assets when it is more likely than not that a tax benefit will not be realized. When a valuation allowance is increased or decreased, a corresponding tax expense or benefit is recorded. The Company recorded income tax expense of $0 and the effective tax rate was 0.0% for the three and six months ended June 30, 2026 and 2025. The effective income tax rate for the three and six months ended June 30, 2026 and 2025 differs from the federal statutory rate of 21% primarily due to a full valuation allowance against net deferred tax assets as it is more likely than not that the deferred tax assets will not be realized due to the cumulative losses sustained by the Company to date.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Issued Accounting Pronouncements In November 2024, the FASB issued ASU No. 2024-03, Income Statement — Reporting Comprehensive Income: Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. This ASU requires public business entities to disclose in the notes to financial statements specific categories within relevant expense captions presented on the face of the income statement. The ASU is effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted. The amendments should be applied on a prospective basis with retrospective application permitted. We are currently evaluating the impact of adopting this ASU on our consolidated financial statements and disclosures.

Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2026

Basis of Accounting, Policy [Policy Text Block]

Basis of Presentation

The accompanying unaudited consolidated financial statements and the related notes (the “Financial Statements”) have been prepared in conformity with the U.S. Securities and Exchange Commission (the “SEC”) requirements for quarterly reports on Form 10-Q, and consequently exclude certain disclosures normally included in audited consolidated financial statements prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). These Financial Statements include the accounts of SHG and its consolidated subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The Financial Statements should be read in conjunction with the audited consolidated financial statements and the notes contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025, which includes additional disclosures and a summary of the Company's significant accounting policies. In the Company’s opinion, these Financial Statements include all adjustments, consisting of normal recurring items, considered necessary by management to fairly state the Company’s results of operation, financial position, and cash flows.

Certain historical amounts have been reclassified to conform to the current year’s presentation.

Use of Estimates, Policy [Policy Text Block]

Use of Estimates

The preparation of consolidated financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting periods. Such estimates include assumptions used within impairment analyses, estimated useful lives of depreciable assets and amortizable costs, estimates of inputs utilized in determining the fair value of financial instruments such as warrants, and estimates and assumptions related to right-of-use assets and operating lease liabilities. Actual results could differ materially from those estimates.

Risks and Uncertainties [Policy Text Block]

Risks and Uncertainties

The Company is subject to risks and uncertainties common to early-stage companies. For most of its history, the Company has been engaged in securing access to land through ground leases and developing and constructing aviation hangars. The major risks faced by the Company are its future ability to obtain additional tenants for the facilities that it constructs, and to contract with such tenants for rental income in an amount that is sufficient to meet the Company’s financial obligations, including increasing construction costs due to inflation and increased borrowing costs to the extent that the Company incurs additional indebtedness.

Liquidity and Capital Resources [Policy Text Block]

Liquidity and Capital Resources

As a result of ongoing construction projects and business development activities, including the development of aircraft hangars and the leasing of available hangar space, the Company has incurred recurring losses and negative cash flows from operating activities since its inception. The Company expects to continue to invest in such activities and generate operating losses in the near future.

The Company obtained long-term financing through bond and equity offerings, committed bank drawdown facility, and has the ability to utilize its at-the-market offering program to fund its construction, lease, and operational commitments, and believes its liquidity is sufficient to allow continued operations for more than one year after the date these financial statements are issued.

Consolidation, Policy [Policy Text Block]

Basis of Consolidation

SHG is deemed to have a controlling interest of Sky through its appointment as the managing member of Sky, in which SHG has control over the affairs and decision-making of Sky. The interests in Sky not owned by the Company are presented as non-controlling interests. Sky’s ownership percentage in each of its consolidated subsidiaries is 100%, unless otherwise disclosed.

Cost of Construction [Policy Text Block]

Cost of Construction

Cost of construction on the accompanying consolidated balance sheets is carried at cost. The cost of acquiring an asset includes the costs necessary to bring a capital project to the condition necessary for its intended use. Costs are capitalized once the construction of a specific capital project is probable. Construction labor and other direct costs of construction are capitalized. Professional fees for engineering, procurement, consulting, and other soft costs that are directly identifiable with the project and are considered an incremental direct cost are capitalized. Activities associated with internally manufactured hangar buildings, including materials, direct manufacturing labor, and manufacturing overhead directly identifiable with such activities are allocated to our construction projects and capitalized. The Company allocates a portion of its internal salaries to both capitalized cost of construction and to general and administrative expense based on the percentage of time certain employees worked in the related areas. Interest, net of the amortization of debt issuance costs and premiums, and net of interest income earned on bond proceeds, is also capitalized until the capital projects are completed.

Once a capital project is complete, the Company begins to depreciate the constructed asset on a straight-line basis over the lesser of the estimated useful life of the asset or the remaining term of the related ground lease, including expected renewal terms.

Lessee, Leases [Policy Text Block]

Leases

The Company accounts for leases under Accounting Standards Codification (“ASC”) Topic 842, Leases. The Company determines whether a contract contains a lease at the inception of the contract. ASC Topic 842 requires lessees to recognize lease liabilities and right-of-use (“ROU”) assets for all operating leases with terms of more than 12 months on the consolidated balance sheets. The Company has made an accounting policy election to not recognize leases with an initial term of 12 months or less on the Company’s consolidated balance sheets and will recognize those lease payments in the consolidated statements of operations on a straight-line basis over the lease term. When management determines that it is reasonably certain that the Company will exercise its options to renew the leases, the renewal terms are included in the lease term and the resulting ROU asset and lease liability balances.

The Company has lease agreements with lease and non-lease components; the Company has elected the accounting policy to not separate lease and non-lease components for all underlying asset classes. The Company has not elected to capitalize any interest cost that is implicit within its operating leases into cost of construction on the consolidated balance sheet, but instead, expenses its ground lease cost as a component of operating expenses in the consolidated statements of operations.

All of the Company’s ground leases at airports are classified as operating leases under ASC Topic 842. Management has determined that it is reasonably certain that the Company will exercise its options to renew the leases, and therefore the renewal options are included in the lease term and the resulting ROU asset and operating lease liability balances. As the Company’s lease agreements do not provide a readily determinable implicit rate, nor is the rate available to the Company from its lessors, the Company uses its incremental borrowing rate to determine the present value of the lease payments.

The Company has operating leases that contain variable payments, most commonly in the form of common area maintenance and operating expense charges, which are based on actual costs incurred. These variable payments were excluded from the calculation of the ROU asset and operating lease liability balances since they are not fixed or in-substance fixed payments. These variable payments were not material in amount for the three and six months ended June 30, 2026 and 2025. Some of the leases contain covenants that require the Company to construct the hangar facilities on the leased grounds within a certain period and spend a set minimum dollar amount. For one of the leases, the shortfall (if any) must be paid to the lessor. See Note 18 — Commitments and Contingencies.

Derivatives, Policy [Policy Text Block]

Warrants liability

The Company accounts for its Warrants (as defined in Note 11 — Warrants) in accordance with the guidance contained in ASC Topic 815, “Derivatives and Hedging” (“ASC 815”), under which warrants that do not meet the criteria for equity classification and must be recorded as derivative liabilities. Accordingly, the Company classifies the Warrants as liabilities carried at their fair value and adjusts the warrants to fair value at each reporting period. This liability is subject to re-measurement at each balance sheet date until the warrants are exercised or expire, and any change in fair value is recognized in the consolidated statement of operations.

Revenue [Policy Text Block]

Revenue recognition

The Company leases the hangar facilities that it constructs to third parties. The Company determines whether a contract contains a lease at the inception of the contract. The lease agreements are either on a month-to-month basis or have a defined term and may have options to extend the term. Some of the leases contain options to terminate the lease by either party with given notice. The Company expects to continue to derive benefit from the underlying assets after the end of the lease term through further leasing arrangements. The underlying assets are the leasehold interest that the Company has in connection with its ground leases. There are no options given to the lessee to purchase the underlying assets.

Rental revenue is recognized in accordance with ASC 842 and includes fixed payments of cash rents, which represents revenue each tenant pays in accordance with the terms of its respective lease and is recognized on a straight-line basis over the term of the lease. Rental revenue and the corresponding rent and other receivables are recorded net of any concessions and uncollectible tenant receivables, if any, for all periods presented. The Company evaluates the collectability of tenant receivables for payments required under the lease agreements. If the Company determines that collectability is not probable, the Company recognizes any difference between revenue amounts recognized to date under ASC 842 and payments that have been collected from the lessee, including any additional rent or lease termination fees, as a current period adjustment to rental revenue.

At certain of the Company’s hangar campuses, the Company recognizes revenue from ground-based services, such as the fueling and towing of aircraft under ASC Topic 606, Revenue from Contracts with Customers. Revenue for the sale of aircraft fuel is recognized at the time customer obtains control of the fuel. Revenue for the sale of other ground-based services is recognized at the time the service is performed and provided to customers. Customers are invoiced at the time the services are performed and the associated revenue is recognized in the period it is earned. The Company’s fueling arrangements generally are unique at each location it operates, and may be accounted for on a gross or net basis. The Company determines whether to recognize fuel and services revenue on a gross or net basis based on consideration of various factors, including whether the Company has control of the products or services prior to delivery to customers, the Company’s degree of latitude in establishing the sales price, whether the Company carries the associated inventory risk, and which party is the primary obligor within such sales arrangements.

For the three and six months ended June 30, 2026 and 2025, the Company did not derive 10% of its revenue from any single tenant.

Income Tax, Policy [Policy Text Block]

Income Taxes

SHG is classified as a corporation for U.S. Federal income tax purposes and is subject to U.S. Federal and state income taxes. SHG includes in income, for U.S. Federal income tax purposes, its allocable portion of income from the “pass-through” entities in which it holds an interest, including Sky. The “pass-through” entities are not subject to U.S. Federal and certain state income taxes at the entity level, and instead, the tax liabilities with respect to taxable income are passed through to the members, including SHG. As a result, prior to the transactions contemplated by that certain Equity Purchase Agreement, dated as of August 1, 2021, by and among Yellowstone Acquisition Company (“YAC”) and Sky, which we refer to as the Yellowstone Transaction, Sky was not subject to U.S. Federal and certain state income taxes at the entity level.

The Company follows the asset and liability method of accounting for income taxes. This method gives consideration to the future tax consequences associated with the differences between the financial accounting and tax basis of the assets and liabilities as well as the ultimate realization of any deferred tax asset resulting from such differences, as well as from net operating losses and other tax-basis carryforwards. Valuation allowances are recorded to reduce deferred tax assets when it is more likely than not that a tax benefit will not be realized. When a valuation allowance is increased or decreased, a corresponding tax expense or benefit is recorded.

The Company recorded income tax expense of $0 and the effective tax rate was 0.0% for the three and six months ended June 30, 2026 and 2025. The effective income tax rate for the three and six months ended June 30, 2026 and 2025 differs from the federal statutory rate of 21% primarily due to a full valuation allowance against net deferred tax assets as it is more likely than not that the deferred tax assets will not be realized due to the cumulative losses sustained by the Company to date.

New Accounting Pronouncements, Policy [Policy Text Block]

Recently Issued Accounting Pronouncements

In November 2024, the FASB issued ASU No. 2024-03, Income Statement — Reporting Comprehensive Income: Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. This ASU requires public business entities to disclose in the notes to financial statements specific categories within relevant expense captions presented on the face of the income statement. The ASU is effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted. The amendments should be applied on a prospective basis with retrospective application permitted. We are currently evaluating the impact of adopting this ASU on our consolidated financial statements and disclosures.