|
Statements of Comprehensive Income (USD $)
|
12 Months Ended | ||
|---|---|---|---|
|
Mar. 31, 2013
|
Mar. 31, 2012
|
Mar. 31, 2011
|
|
| Comprehensive Income [Abstract] | |||
| Net income | $ 11,828,838 | $ 11,381,095 | $ 13,360,945 |
| Unrealized (gain) loss from marketable securities, net of tax | 470,270 | 27,018 | (69,288) |
| Comprehensive income | $ 12,299,108 | $ 11,408,113 | $ 13,291,657 |