Annual report pursuant to Section 13 and 15(d)

Capital Stock and Stock Restrictions (Details)

v3.8.0.1
Capital Stock and Stock Restrictions (Details) - shares
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Equity, Class of Treasury Stock [Line Items]    
Treasury Stock, Shares Start [1] (4,440,600)  
Treasury Stock, Shares End (4,633,871) (4,440,600) [1]
Class A Common Stock [Member]    
Equity, Class of Treasury Stock [Line Items]    
Common Stock, Shares, Outstanding Start 12,015,043 [1] 11,796,000
Treasury Stock, Shares, Acquired (193,000) (50,000)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures 324,000 269,000
Common Stock, Shares, Outstanding End 12,145,743 12,015,043 [1]
Class B Common Stock [Member]    
Equity, Class of Treasury Stock [Line Items]    
Common Stock, Shares, Outstanding Start 3,484,287 [1] 3,484,000
Common Stock, Shares, Outstanding End 3,484,287 3,484,287 [1]
Treasury Stock [Member]    
Equity, Class of Treasury Stock [Line Items]    
Treasury Stock, Shares Start (4,441,000) (4,391,000)
Treasury Stock, Shares, Acquired (193,000) (50,000)
Treasury Stock, Shares End (4,634,000) (4,441,000)
[1] All common stock (except authorized shares), equity share, and per share amounts have been retroactively adjusted to reflect a one-for-four reverse stock split, which was effective June 7, 2017.