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Concentration Risk, Threshold Percentage

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Increase (Decrease) In Deferred Charges From Recognition Of Receivables

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Indefinite-Lived Intangible Assets, Period Increase (Decrease) From Recognition Of Receivables

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Summary Of Significant Accounting Policies [Line Items]

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

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Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Term of lessor's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Summary of Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Mar. 31, 2025 USD ($) segment $ / shares shares	Mar. 31, 2024 USD ($) shares	Sep. 30, 2021	Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items]
Number of reportable segments \| segment	1
Number of operating segments \| segment	1
Asset retirement obligation, liabilities settled	$ (5,000)	$ 0
Increase (decrease) in asset retirement obligations accrual	$ (112,000)	85,000
Wireless licenses term	10 years
Impairment charges	$ 0	0
Indefinite-lived intangible assets, period Increase from recognition of receivables	10,100,000
Increase in deferred charges	9,200,000
Impairment of long-lived assets	0	$ 0
Lease extension			10 years	10 years
Tax benefits attributed to share-based compensation expense	$ 0
Potentially dilutive securities outstanding but excluded from computation of earnings per share \| shares	221,802	241,629
Sales Revenue, Services, Net \| Each Customer \| Customer Concentration Risk
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	10.00%	10.00%
Leased Premises
Summary Of Significant Accounting Policies [Line Items]
Asset retirement obligation, liabilities settled		$ 0
Advertising
Summary Of Significant Accounting Policies [Line Items]
Advertising and promotional expense	$ 109,000	$ 62,000
Stock Options
Summary Of Significant Accounting Policies [Line Items]
Award expiration period	10 years
Award requisite service period	3 years
Dividend yield	0.00%	0.00%
Stock Options \| Grants Prior To November 2020
Summary Of Significant Accounting Policies [Line Items]
Award requisite service period	4 years
Restricted Stock
Summary Of Significant Accounting Policies [Line Items]
Dividend yield	0.00%
Minimum
Summary Of Significant Accounting Policies [Line Items]
Lease extension	3 years
Accelerated vesting provision, change in control, purchase price (in dollars per share) \| $ / shares	$ 100
Maximum
Summary Of Significant Accounting Policies [Line Items]
Lease extension	10 years