Inventory Finance Receivables and Allowance for Loan Loss (Details 4)	Sep. 30, 2012	Mar. 31, 2012
Arizona [Member]
Geographic Concentration of Inventory Finance Receivables in Key States
Inventory finance receivables concentrations	17.10%	21.40%
Texas [Member]
Geographic Concentration of Inventory Finance Receivables in Key States
Inventory finance receivables concentrations	11.40%	11.30%
Florida [Member]
Geographic Concentration of Inventory Finance Receivables in Key States
Inventory finance receivables concentrations	8.10%	10.70%
California [Member]
Geographic Concentration of Inventory Finance Receivables in Key States
Inventory finance receivables concentrations	3.80%	3.00%