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Income Taxes - Provision for income taxes (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012
Current: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 8,709,338 | $ 10,187,010 | $ 11,799,843
State |  |  |  |  |  |  |  |  | 1,393,675 | 1,661,860 | 1,881,400
Total current |  |  |  |  |  |  |  |  | 10,103,013 | 11,848,870 | 13,681,243
Deferred: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 1,474,425 | 598,674 | 211,544
State |  |  |  |  |  |  |  |  | 235,940 | 97,665 | 33,729
Total deferred |  |  |  |  |  |  |  |  | 1,710,365 | 696,339 | 245,273
Income tax expense | $ 2,528,895 | $ 2,833,019 | $ 2,886,484 | $ 3,564,980 | $ 3,046,179 | $ 2,878,811 | $ 3,238,458 | $ 3,381,761 | $ 11,813,378 | $ 12,545,209 | $ 13,926,516

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