Statements of Comprehensive Income (Unaudited) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
|
| Net income | $ 4,282,610 | $ 3,161,035 | $ 8,227,659 | $ 6,458,650 |
| Unrealized gain from marketable securities, net of tax | 51,237 | 12,738 | (55,790) | 67,765 |
| Comprehensive income | $ 4,333,847 | $ 3,173,773 | $ 8,171,869 | $ 6,526,415 |