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Marketable Securities (Fair Value Of Marketable Securities By Maturity) (Details) (USD $)
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Dec. 31, 2013
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Mar. 31, 2013
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|---|---|---|
| Marketable Securities [Abstract] | ||
| Marketable securities, Total, fair value | $ 90,877,946 | $ 82,751,286 |
| Marketable securities, debt maturities due within one year, fair value | 10,293,147 | |
| Marketable securities, debt maturities due after one year through three years, fair value | 37,031,172 | |
| Marketable securities, debt maturities due after three years through five years, fair value | $ 43,553,627 |