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Stock-Based Compensation (Summary Of Stock Options And Warrants) (Details) (USD $)
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12 Months Ended | ||||||||
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Mar. 31, 2013
Option Shares Reserved [Member]
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Mar. 31, 2012
Option Shares Reserved [Member]
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Mar. 31, 2011
Option Shares Reserved [Member]
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Mar. 31, 2013
Options [Member]
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Mar. 31, 2012
Options [Member]
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Mar. 31, 2011
Options [Member]
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Mar. 31, 2013
Warrants [Member]
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Mar. 31, 2011
Warrants [Member]
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Mar. 31, 2010
Warrants [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||
| Options Outstanding, Beginning | 162,230 | 166,230 | 170,230 | 109,000 | 175,000 | 254,500 | 10,000 | 10,000 | 10,000 |
| Granted | (4,000) | (4,000) | (4,000) | 4,000 | 4,000 | 4,000 | |||
| Exercised | (64,000) | (70,000) | (83,500) | ||||||
| Terminated | (6,000) | ||||||||
| Options Outstanding, Ending | 158,230 | 162,230 | 166,230 | 49,000 | 109,000 | 175,000 | 4,000 | 10,000 | 10,000 |
| Weighted Average Option Exercise Price, Beginning | $ 25.85 | $ 21.54 | $ 17.28 | $ 16.28 | $ 16.28 | $ 16.28 | |||
| Granted | $ 54.11 | $ 58.25 | $ 42.45 | ||||||
| Exercised | $ 24.23 | $ 16.93 | $ 9.56 | ||||||
| Terminated | $ 7.35 | ||||||||
| Weighted Average Option Exercise Price, Ending | $ 30.27 | $ 25.85 | $ 21.54 | $ 29.69 | $ 16.28 | $ 16.28 | |||