Basis of Presentation - Summary of change to consolidated statements of income (Details 1) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Consolidated Statements of Income
Interest and fee income on finance receivables	$ 20,943,161	$ 20,696,241	$ 41,412,533	$ 41,114,198
Provision for credit losses	3,973,104	3,261,721	6,614,895	6,364,987
Operating income	7,203,036	8,388,596	16,468,509	17,177,813
Income tax expense	2,886,484	3,238,458	6,451,464	6,620,219
Net income	4,316,552	5,150,138	10,017,045	10,557,594
Earnings per share - basic (in dollars per share)	$ 0.36	$ 0.43	$ 0.83	$ 0.88
Earnings per share - diluted (in dollars per share)	$ 0.35	$ 0.42	$ 0.82	$ 0.87
Reported
Consolidated Statements of Income
Interest and fee income on finance receivables		17,761,998		35,032,086
Provision for credit losses		308,340		318,712
Operating income		8,407,734		17,141,976
Income tax expense		3,245,784		6,606,501
Net income		5,161,950		10,535,475
Earnings per share - basic (in dollars per share)		$ 0.43		$ 0.88
Earnings per share - diluted (in dollars per share)		$ 0.42		$ 0.86
Correction
Consolidated Statements of Income
Interest and fee income on finance receivables		2,934,243		6,082,112
Provision for credit losses		2,953,381		6,046,275
Operating income		(19,138)		35,837
Income tax expense		(7,326)		13,718
Net income		$ (11,812)		$ 22,119
Earnings per share - basic (in dollars per share)
Earnings per share - diluted (in dollars per share)				$ 0.01