v3.26.1
Summary of Significant Accounting Policies - Narrative (Details)
$ / shares in Units, license in Millions
12 Months Ended
Mar. 31, 2026
USD ($)
license
segment
$ / shares
shares
Mar. 31, 2025
USD ($)
license
shares
Summary Of Significant Accounting Policies [Line Items]    
Number of reportable segments | segment 1  
Number of operating segments | segment 1  
Asset retirement obligation, liabilities settled $ (410,000) $ (5,000)
Decrease in asset retirement obligations accrual $ (110,000) (112,000)
Wireless licenses term 10 years  
Impairment charges $ 0 $ 0
Broadband license, held-for-sale, term 1 year  
Broadband license, held-for-sale | license 0.0 0.0
Impairment of long-lived assets $ 0 $ 0
Tax benefits attributed to share-based compensation expense $ 0  
Potentially dilutive securities outstanding but excluded from computation of earnings per share | shares 1,975,287 221,802
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 July 2023    
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%  
Advertising    
Summary Of Significant Accounting Policies [Line Items]    
Advertising and promotional expense $ 56,000 $ 100,000
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  
Sales Revenue, Services, Net | Each Customer | Customer Concentration Risk    
Summary Of Significant Accounting Policies [Line Items]    
Concentration risk, percentage 10.00% 10.00%