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Revenue (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2019
Sep. 30, 2014
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Revenue recognized     $ 600      
Contract liability $ 3,600   3,600   $ 4,200  
Cost of Revenue [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Contract and contract acquisition costs     258      
Sales [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Contract and contract acquisition costs     178      
Spectrum [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Revenue recognized $ 183 $ 183 $ 547 $ 547    
Contract liability           $ 7,500
Contractual term 10 years   10 years      
Goosetown [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Recurring revenue 20.00%   20.00%      
Recurring revenue term     2 years      
TeamConnect LLC [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Service fee term     24 months      
Goosetown And A BEEP [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Service transition period     2 years      
Purchased Customers [Member] | Minimum [Member] | Goosetown And A BEEP [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Recurring revenue 20.00%   20.00%      
Purchased Customers [Member] | Maximum [Member] | Goosetown And A BEEP [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Recurring revenue 100.00%   100.00%      
Diga-Talk Plus [Member] | A BEEP [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Recurring revenue term     2 years      
Diga-Talk Plus [Member] | Minimum [Member] | A BEEP [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Recurring revenue 35.00%   35.00%      
Diga-Talk Plus [Member] | Maximum [Member] | A BEEP [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Recurring revenue 15.00%   15.00%