Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2011	Oct. 31, 2010
Revenues:
Sales	$ 100,128	$ 82,611	$ 190,452	$ 165,213
Interest income	10,679	9,224	20,879	18,082
Total revenue	110,807	91,835	211,331	183,295
Costs and expenses:
Cost of sales, excluding depreciation shown below	57,807	47,269	109,369	93,702
Selling, general and administrative	16,721	14,684	32,918	29,475
Provision for credit losses	22,623	18,767	41,157	34,905
Interest expense	575	803	1,018	1,770
Depreciation and amortization	565	465	1,103	920
Total costs and expenses	98,291	81,988	185,565	160,772
Income before taxes	12,516	9,847	25,766	22,523
Provision for income taxes	4,756	3,658	9,725	8,369
Net income	7,760	6,189	16,041	14,154
Less: Dividends on mandatorily redeemable preferred stock	(10)	(10)	(20)	(20)
Net income attributable to common stockholders	$ 7,750	$ 6,179	$ 16,021	$ 14,134
Earnings per share:
Basic (in Dollars per share)	$ 0.79	$ 0.57	$ 1.60	$ 1.28
Diluted (in Dollars per share)	$ 0.77	$ 0.56	$ 1.55	$ 1.25
Weighted average number of shares outstanding:
Basic (in Shares)	9,776,817	10,892,177	10,024,088	11,057,977
Diluted (in Shares)	10,081,274	11,117,087	10,330,549	11,276,850