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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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