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Stockholders' Equity (narrative) (detail) - USD ($)
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2003
Cash dividends paid on preferred stock $ 23,000      
401 (k) match stock amount $ 1,800,000 $ 2,200,000    
6% Cumulative Preferred Stock [Member]        
Preferred Stock, Dividend Rate, Percentage 6.00%      
Preferred Stock, Par or Stated Value Per Share $ 0.25      
Preferred Stock, Shares Authorized 200,000      
Preferred Stock, Shares Outstanding 200,000 200,000 200,000  
Cash dividends paid on preferred stock $ 3,000 $ 3,000 $ 3,000  
10% Nonredeemable Convertible Preferred Stock [Member]        
Preferred Stock, Dividend Rate, Percentage 10.00%      
Preferred Stock, Par or Stated Value Per Share $ 0.025      
Preferred Stock, Shares Authorized 1,400,000      
Preferred Stock, Shares Outstanding 807,240 807,240 807,240  
10% Series A Nonredeemable Convertible Preferred Stock [Member]        
Preferred Stock, Dividend Rate, Percentage 10.00%      
Share For Share Conversion Number 20      
Preferred Stock, Shares Outstanding 407,240      
10% Series B Nonredeemable Convertible Preferred Stock [Member]        
Share For Share Conversion Number 30      
Preferred Stock, Shares Outstanding 400,000      
Participating Preferred Stock [Member]        
Preferred Stock Liquidation Preference $ 12      
Preferred Stock, Par or Stated Value Per Share 0.025      
Stated Value Per Share $ 11.931      
Preferred Stock, Shares Authorized 90,826      
Preferred Stock, Shares Outstanding 90,826 90,826 90,901  
Cash dividends paid on preferred stock $ 20,000 $ 20,000 $ 20,000  
2003 Series Participating Preferred Stock [Member]        
Preferred Stock Liquidation Preference $ 15.5      
Preferred Stock, Par or Stated Value Per Share $ 0.025      
Preferred Stock, Shares Authorized 500      
Preferred Stock, Shares Outstanding 500 50,500 257,790  
Stock Conversions 50,000      
Price Per Share $ 16.6      
Preferred Stock Shares Issued       967,742
No Par Value Preferred Stock [Member]        
Preferred Stock, Shares Authorized 30,000      
Class A Preferred Stock [Member]        
Preferred Stock, Par or Stated Value Per Share $ 0.025      
Preferred Stock, Shares Authorized 8,200,000      
Common Stock Capital Shares Reserved For Future Issuance 91,326 141,326    
Class A Preferred Non Designated Stock [Member]        
Preferred Stock, Shares Authorized 6,708,674      
Common Class A Member        
Common Stock Voting Right Per Share $ 0.05      
Treasury Stock, Value, Acquired, Cost Method $ 2,600,000      
Treasury Stock Shares Acquired 90,500      
Common Class B Member        
Treasury Stock, Value, Acquired, Cost Method $ 2,600,000      
Treasury Stock Shares Acquired 73,459      
Treasury Stock [Member]        
Treasury Stock, Value, Acquired, Cost Method $ 65,700,000      
Treasury Stock Shares Acquired 2,281,550      
401 (k) match shares 64,254      
401 (k) match stock amount $ 1,800,000      
Common Stock [Member]        
Common Stock Capital Shares Reserved For Future Issuance 33,695 33,695