|
Marketable Securities (Amortized Cost And Approximate Fair Values Of Marketable Securities) (Details) (USD $)
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Jun. 30, 2012
|
Mar. 31, 2012
|
|---|---|---|
| Schedule of Investments [Line Items] | ||
| Adjusted Cost | $ 73,994,801 | $ 70,288,971 |
| Gross Unrealized Gains | 1,617,835 | 1,816,397 |
| Gross Unrealized Losses | (44,367) | (108,441) |
| Fair Market Value | 75,568,269 | 71,996,927 |
|
Corporate Bonds [Member]
|
||
| Schedule of Investments [Line Items] | ||
| Adjusted Cost | 56,809,785 | 50,513,389 |
| Gross Unrealized Gains | 1,368,667 | 1,481,604 |
| Gross Unrealized Losses | (43,670) | (76,434) |
| Fair Market Value | 58,134,782 | 51,918,559 |
|
Municipal Bonds [Member]
|
||
| Schedule of Investments [Line Items] | ||
| Adjusted Cost | 17,185,016 | 19,775,582 |
| Gross Unrealized Gains | 249,168 | 334,793 |
| Gross Unrealized Losses | (697) | (32,007) |
| Fair Market Value | $ 17,433,487 | $ 20,078,368 |