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Income Taxes - Provision for income taxes (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Current:                      
Federal                 $ 10,187,010 $ 11,799,843 $ 10,275,756
State                 1,661,860 1,881,400 1,683,652
Total current                 11,848,870 13,681,243 11,959,408
Deferred:                      
Federal                 598,674 211,544 (1,237,850)
State                 97,665 33,729 (202,818)
Total deferred                 696,339 245,273 (1,440,668)
Income tax expense $ 3,046,179 $ 2,878,811 $ 3,238,458 $ 3,381,761 $ 3,749,890 $ 3,340,762 $ 3,504,456 $ 3,331,408 $ 12,545,209 $ 13,926,516 $ 10,518,740