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v3.23.1

Summary of Significant Accounting Policies - Narrative (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 USD ($) $ / shares shares | Mar. 31, 2022 USD ($) shares | Mar. 31, 2021 USD ($) shares | Sep. 30, 2021 | Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Liabilities settled | $ 79,000 | $ 109,000 |  |  |
Capitalized change in estimated asset retirement obligations | $ (6,000) | (17,000) | $ 85,000 |  |
Wireless licenses term | 10 years |  |  |  |
Impairment charges | $ 0 | 0 | 0 |  |
Impairment of long-lived assets | 0 | 0 | $ 85,000 |  |
Property and equipment, net | 3,606,000 | $ 2,949,000 |  |  |
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 | 352,000 | 1,343,000 | 1,382,000 |  |
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 |  |  |  |
Advertising |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Advertising and promotional expense | $ 92,000 | $ 89,000 | $ 19,000 |  |
Tier 1 Carrier Partner |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of carriers |  |  | 1 |  |
Customer Concentration Risk | Sales Revenue, Services, Net | Reseller |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of resellers |  |  | 1 |  |
Customer Concentration Risk | Sales Revenue, Services, Net | Domestic Carrier And Reseller |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 17.00% |  |
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 | $ 100,000 | $ 100,000 |  |  |
Network sites and equipment |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment, net |  |  | $ 0 |  |

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