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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2021 | Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Liabilities settled | $ 0 | $ 79,000 |  |
Increase (decrease) in asset retirement obligations accrual | $ 85,000 | (6,000) |  |
Wireless licenses term | 10 years |  |  |
Impairment charges | $ 0 | 0 |  |
Payments to acquire intangible assets | 17,031,000 | 25,004,000 |  |
Indefinite-lived intangible assets, period Increase from recognition of receivables | 9,100,000 |  |  |
Increase in deferred charges | 10,900,000 |  |  |
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 | 241,629 | 352,216 |  |
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] |  |  |  |
Award requisite service period | 4 years |  |  |
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) | $ 100 |  |  |
Maximum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Lease extension | 10 years |  |  |
Advertising |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Advertising and promotional expense | $ 62,000 | $ 92,000 |  |
Customer Concentration Risk | Accounts Receivable |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Accounts receivable | 0 | 0 |  |
Leased Premises |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Liabilities settled | $ 0 | $ 100,000 |  |

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