|
Marketable Securities (Amortized Cost And Approximate Fair Values Of Marketable Securities) (Details) (USD $)
|
Dec. 31, 2012
|
Mar. 31, 2012
|
|---|---|---|
| Schedule of Investments [Line Items] | ||
| Adjusted Cost | $ 77,877,245 | $ 70,288,971 |
| Gross Unrealized Gains | 2,535,426 | 1,816,397 |
| Gross Unrealized Losses | (27,166) | (108,441) |
| Fair Market Value | 80,385,505 | 71,996,927 |
|
Corporate Bonds [Member]
|
||
| Schedule of Investments [Line Items] | ||
| Adjusted Cost | 68,138,943 | 50,513,389 |
| Gross Unrealized Gains | 2,424,000 | 1,481,604 |
| Gross Unrealized Losses | (20,869) | (76,434) |
| Fair Market Value | 70,542,074 | 51,918,559 |
|
Municipal Bonds [Member]
|
||
| Schedule of Investments [Line Items] | ||
| Adjusted Cost | 9,738,302 | 19,775,582 |
| Gross Unrealized Gains | 111,426 | 334,793 |
| Gross Unrealized Losses | (6,297) | (32,007) |
| Fair Market Value | $ 9,843,431 | $ 20,078,368 |