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Note C - Finance Receivables, Net (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Note C - Finance Receivables, Net (Details) [Line Items]    
Finance Receivables, Number of Loan Classes 1crmt_FinanceReceivablesNumberOfLoanClasses  
Finance Receivables, Number of Risk Pools 1crmt_FinanceReceivablesNumberOfRiskPools  
Net Charge Offs As Percentage of Average Finance Receivables 27.80%crmt_NetChargeOffsAsPercentageOfAverageFinanceReceivables 28.20%crmt_NetChargeOffsAsPercentageOfAverageFinanceReceivables
Increase in Provision for Credit Losses (in Dollars)   $ 7.7crmt_IncreaseInProvisionForCreditLosses
Collections as Percentage of Average Financing Receivables 58.70%crmt_CollectionsAsPercentageOfAverageFinancingReceivables 58.00%crmt_CollectionsAsPercentageOfAverageFinancingReceivables
Dellinquecies Greater Than 30 Days As Percentage Of Average Finance Receivables 5.80%crmt_DellinqueciesGreaterThan30DaysAsPercentageOfAverageFinanceReceivables 4.40%crmt_DellinqueciesGreaterThan30DaysAsPercentageOfAverageFinanceReceivables
Minimum [Member]    
Note C - Finance Receivables, Net (Details) [Line Items]    
Financing Receivable Interest Rate 14.00%crmt_FinancingReceivableInterestRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Financing Receivable Payment Period 18 months  
Maximum [Member]    
Note C - Finance Receivables, Net (Details) [Line Items]    
Financing Receivable Interest Rate 15.00%crmt_FinancingReceivableInterestRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Financing Receivable Payment Period 42 months