Statements of Comprehensive Income (Unaudited) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
|
| Net income | $ 3,161,035 | $ 3,305,197 | $ 6,458,650 | $ 6,437,742 |
| Unrealized gain (loss) from marketable securities, net of tax | 12,738 | (240,809) | 67,765 | (15,206) |
| Comprehensive income | $ 3,173,773 | $ 3,064,388 | $ 6,526,415 | $ 6,422,536 |