|
Marketable Securities (Fair Value Of Marketable Securities By Maturity) (Details) (USD $)
|
Mar. 31, 2013
|
Mar. 31, 2012
|
|---|---|---|
| Marketable Securities [Abstract] | ||
| Marketable securities, Total, fair value | $ 82,751,286 | $ 71,996,927 |
| Marketable securities, debt maturities due within one year, fair value | 9,711,029 | |
| Marketable securities, debt maturities due after one year through three years, fair value | 34,310,566 | |
| Marketable securities, debt maturities due after three years through five years, fair value | $ 38,729,691 |