Annual report pursuant to Section 13 and 15(d)

Capital Stock and Stock Restrictions (Details Textual)

v2.4.0.6
Capital Stock and Stock Restrictions (Details Textual) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2013
Preferred Stock [Member]
Mar. 31, 2012
Preferred Stock [Member]
Mar. 31, 2013
Class A Common Stock [Member]
Mar. 31, 2012
Class A Common Stock [Member]
Mar. 31, 2011
Class A Common Stock [Member]
Mar. 31, 2010
Class A Common Stock [Member]
Mar. 31, 2012
Class B Common Stock [Member]
Mar. 31, 2011
Class B Common Stock [Member]
Mar. 31, 2013
Class B Common Stock [Member]
Mar. 31, 2010
Class B Common Stock [Member]
Aug. 31, 2011
August Two Thousand Eleven Authorization [Member]
Class A Common Stock [Member]
Mar. 31, 2013
August Two Thousand Eleven Authorization [Member]
Class A Common Stock [Member]
Mar. 31, 2012
August Two Thousand Eleven Authorization [Member]
Class A Common Stock [Member]
May 31, 2011
February Two Thousand Ten Authorization [Member]
Class A Common Stock [Member]
Feb. 28, 2010
February Two Thousand Ten Authorization [Member]
Class A Common Stock [Member]
Mar. 31, 2011
February Two Thousand Ten Authorization [Member]
Class A Common Stock [Member]
May 31, 2011
February Two Thousand Ten Authorization [Member]
Class B Common Stock [Member]
Mar. 31, 2013
Outside of Publically Announced Repurchase Program [Member]
Class A Common Stock [Member]
Mar. 31, 2012
Outside of Publically Announced Repurchase Program [Member]
Class A Common Stock [Member]
May 14, 2013
Voting Trust [Member]
May 14, 2013
Voting trust and other trusts [Member]
Mar. 31, 2013
Voting trust and other trusts [Member]
Class B Common Stock [Member]
Class of Stock [Line Items]                                                  
Preferred Stock, Shares Authorized       1,000,000 1,000,000                                        
Stock Repurchase Program, Authorized Amount                           $ 20,000,000       $ 10,000,000              
Treasury Stock, Shares, Acquired           5,788,000 6,552,000 356,000             5,700,000 6,400,000 1,000,000   356,064            
Treasury Stock Acquired, Average Cost Per Share                             $ 2.20 $ 2.63 $ 3.43   $ 1.56   $ 2.32 $ 3.52      
Common Stock, Shares, Outstanding           44,969,841 50,429,399 54,174,000 52,762,000 13,937,151 14,556,000 13,937,151 14,694,000                       13,937,150
Stock Repurchase Program Remaining Authorized Repurchases Amount                             100,000                    
Shares Paid for Tax Withholding for Share Based Compensation                                         133,816 113,734      
Conversion of Stock, Shares Converted             619,000 138,000   (619,000) (138,000)                 618,664          
Payments for Repurchase of Common Stock $ 12,733,000 $ 17,385,000 $ 561,000                           $ 3,400,000                
Voting Control                                             51.40% 55.40%