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Stockholders' Equity (narrative) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  | 0 Months Ended | 12 Months Ended |  | 12 Months Ended |
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Mar. 31, 2013 | Mar. 31, 2013 6% Cumulative Preferred Stock [Member] | Mar. 31, 2012 6% Cumulative Preferred Stock [Member] | Mar. 31, 2011 6% Cumulative Preferred Stock [Member] | Mar. 31, 2013 10% Nonredeemable Convertible Preferred Stock [Member] | Mar. 31, 2012 10% Nonredeemable Convertible Preferred Stock [Member] | Mar. 31, 2011 10% Nonredeemable Convertible Preferred Stock [Member] | Mar. 31, 2013 10% Series A Nonredeemable Convertible Preferred Stock [Member] | Mar. 31, 2013 10% Series B Nonredeemable Convertible Preferred Stock [Member] | Mar. 31, 2013 Participating Preferred Stock [Member] | Mar. 31, 2012 Participating Preferred Stock [Member] | Mar. 31, 2011 Participating Preferred Stock [Member] | Mar. 31, 2013 2003 Series Participating Preferred Stock [Member] | Mar. 31, 2012 2003 Series Participating Preferred Stock [Member] | Mar. 31, 2011 2003 Series Participating Preferred Stock [Member] | Mar. 31, 2013 2006 Series Participating Preferred Stock [Member] | Mar. 31, 2013 No Par Value Preferred Stock [Member] | Mar. 31, 2013 Class A Preferred Stock [Member] | Aug. 30, 2012 Common Class A Member | Mar. 31, 2013 Common Class A Member | Mar. 31, 2012 Common Class A Member | Mar. 31, 2013 Common Class B Member | Mar. 31, 2013 Treasury Stock [Member] | Mar. 31, 2013 Common Stock [Member]
Preferred Stock, Dividend Rate, Percentage |  | 6.00% |  |  | 10.00% |  |  | 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 |  |  |  |  |  |
Share For Share Conversion Number |  |  |  |  |  |  |  | 20 | 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Voting Right Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.05 |  |  |  |
Preferred Stock, Shares Authorized | 6,445,248 | 200,000 |  |  | 1,400,000 |  |  |  |  | 91,962 |  |  | 262,790 |  |  |  | 30,000 | 8,200,000 |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  | 200,000 | 200,000 | 200,000 | 807,240 | 807,240 | 807,240 | 407,240 | 400,000 | 91,962 | 97,870 | 102,047 | 262,790 | 312,790 | 313,304 |  |  |  |  |  |  |  |  |
Stock Conversions |  |  |  |  |  |  |  |  |  | 5,908 |  |  | 50,000 |  |  | 1,025,220 |  |  |  |  |  |  |  |
Cash dividends paid on preferred stock | $ 23,000 | $ 3,000 |  |  | $ 20,181 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Capital Shares Reserved For Future Issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 354,752 | 410,660 |  |  | 33,695
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,930,000 | 3,780,000 |  | 59,000 | 5,274,000 |
Treasury Stock Shares Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 864,334 | 129,989 |  | 2,458 | 197,280 |
Stock Issued For Bonus Program Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 29,000 |  |
Stock Issued For Bonus Program Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,330 |  |
Price Per Share |  |  |  |  |  |  |  |  |  |  |  |  | $ 16.60 |  |  | $ 24.385 |  |  |  |  |  |  |  |
Preferred Stock Shares Issued |  |  |  |  |  |  |  |  |  |  |  |  | 967,742 |  |  | 1,025,220 |  |  |  |  |  |  |  |

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