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Stock Purchases Rights, Stock Options and Warrants (Narrative) (Details)
3 Months Ended 6 Months Ended
Sep. 15, 2014
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
$ / shares
item
shares
Sep. 30, 2014
USD ($)
May. 31, 2015
$ / shares
Mar. 31, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options vested and outstanding   1,592,667   1,592,667     1,425,451
Stock options issued to purchase common stock       170,250      
Exercise price per share | $ / shares       $ 38.42      
Stock options, contractual life       10 years      
Number of equal stock option vesting installments | item       3      
Expected life of awards       5 years      
Expected volatility       40.00%      
Expected dividend yield       0.00%      
Expected forfeiture rate       2.00%      
Stock compensation expense | $   $ 1,105,976 $ 1,180,824 $ 2,455,611 [1] $ 3,276,600    
Weighted average fair value for each stock option award granted | $ / shares       $ 14.27      
Unrecognized compensation cost related to non-vested share options granted | $   6,600,000   $ 6,600,000      
Weighted average period of recognition of unrecognized compensation cost       3 years      
Intrinsic value of options outstanding | $   13,300,000   $ 13,300,000      
Intrinsic value of options exercisable | $   $ 4,000,000   $ 4,000,000      
Subsidiary equity units for which investor has right to convert to common stock   500,000   500,000      
Warrants outstanding   6,039   6,039     6,039
Sale of stock, price per share | $ / shares           $ 40.00  
Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Risk-free interest rate       1.50%      
Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Risk-free interest rate       1.69%      
Common Class B Units [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Conversion ratio       one      
Common Class A [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of units owned   100.00%   100.00%      
PDV Spectrum Holding Company, LLC [Member] | Common Class B Units [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Proceeds from investments, value | $ $ 10,000,000            
Proceeds from investment, shares 500,000            
Sale of stock, price per share | $ / shares $ 20.00            
Preferred Stock Series AA [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock compensation expense | $ [1]            
Common Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock compensation expense | $ [1]       $ 12      
First Anniversary [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of vesting for stock granted to employees       25.00%      
Second Anniversary [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of vesting for stock granted to employees       25.00%      
Third Anniversary [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of vesting for stock granted to employees       25.00%      
Fourth Anniversary [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of vesting for stock granted to employees       25.00%      
2014 Stock Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options vested and outstanding   54,479   54,479      
Common stock authorized and reserved for issuance   1,823,651   1,823,651      
Percentage of increase in number of shares of common stock issued and outstanding       5.00%      
Restricted Stock Units [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
restricted stock unit awards   0   0      
Restricted stock units outstanding   83,804   83,804      
Stock compensation expense | $         $ 1,676,080    
Stock compensation expense related shares issued, shares       0      
[1] includes restricted shares issued.