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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 |  |  |

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