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Stockholders' Equity (narrative) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  | 0 Months Ended | 12 Months Ended
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Mar. 31, 2014 | Mar. 31, 2014 6% Cumulative Preferred Stock [Member] | Mar. 31, 2013 6% Cumulative Preferred Stock [Member] | Mar. 31, 2012 6% Cumulative Preferred Stock [Member] | Mar. 31, 2014 10% Nonredeemable Convertible Preferred Stock [Member] | Mar. 31, 2013 10% Nonredeemable Convertible Preferred Stock [Member] | Mar. 31, 2012 10% Nonredeemable Convertible Preferred Stock [Member] | Mar. 31, 2014 10% Series A Nonredeemable Convertible Preferred Stock [Member] | Mar. 31, 2014 10% Series B Nonredeemable Convertible Preferred Stock [Member] | Mar. 31, 2014 Participating Preferred Stock [Member] | Mar. 31, 2013 Participating Preferred Stock [Member] | Mar. 31, 2012 Participating Preferred Stock [Member] | Mar. 31, 2014 2003 Series Participating Preferred Stock [Member] | Mar. 31, 2013 2003 Series Participating Preferred Stock [Member] | Mar. 31, 2012 2003 Series Participating Preferred Stock [Member] | Mar. 31, 2012 2006 Series Participating Preferred Stock [Member] | Mar. 31, 2014 2006 Series Participating Preferred Stock [Member] | Mar. 31, 2014 Class A Preferred Stock [Member] | Aug. 30, 2012 Common Class A Member | Mar. 31, 2014 Common Class A Member | Mar. 31, 2014 Common Class B Member | Mar. 31, 2014 Treasury Stock [Member]
Preferred Stock, Dividend Rate, Percentage |  | 6.00% |  |  | 10.00% |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Liquidation Preference |  |  |  |  |  |  |  |  |  | $ 12 |  |  | $ 15.50 |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  | $ 0.25 |  |  | $ 0.025 |  |  |  |  | $ 0.025 |  |  | $ 0.025 |  |  |  |  | $ 0.025 |  |  |  |
Stated Value Per Share |  |  |  |  |  |  |  |  |  | $ 11.931 |  |  |  |  |  |  |  |  |  |  |  |
Share For Share Conversion Number |  |  |  |  |  |  |  | 20 | 30 |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Voting Right Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.05 |  |
Preferred Stock, Shares Authorized |  | 200,000 |  |  | 1,400,000 |  |  |  |  | 90,901 |  |  | 257,790 |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  | 200,000 | 200,000 | 200,000 | 807,240 | 807,240 | 807,240 | 407,240 | 400,000 | 90,901 | 91,962 | 97,870 | 257,790 | 262,790 | 312,790 |  |  |  |  |  |  |
Stock Conversions |  |  |  |  |  |  |  |  |  | 1,061 |  |  | 5,000 |  |  | 1,025,220 |  |  |  |  |  |
Cash dividends paid on preferred stock | $ 23,000 | $ 3,000 |  |  |  |  |  |  |  | $ 20,000 |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,900,000 | 700,000 |  | 4,000,000
Treasury Stock Shares Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 864,334 | 20,186 |  | 150,710
Stock Issued For Bonus Program Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 108 |
Price Per Share |  |  |  |  |  |  |  |  |  |  |  |  | $ 16.60 |  |  |  | $ 24.385 |  |  |  |  |
Preferred Stock Shares Issued |  |  |  |  |  |  |  |  |  |  |  |  | 967,742 |  |  |  | 1,025,220 |  |  |  |  |
401 (k) match shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66,756
401 (k) match stock amount | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000

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