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Note C - Finance Receivables (Details) - Financing Receivables Analysis
 9 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Financing Receivables Analysis [Abstract]    
Principal collected as a percent of average finance receivables 41.90%crmt_PrincipalCollectedAsAPercentOfAverageFinancingReceivables 40.50%crmt_PrincipalCollectedAsAPercentOfAverageFinancingReceivables
Average down-payment percentage 6.20%crmt_AverageDownpaymentPercentage 5.60%crmt_AverageDownpaymentPercentage
Average originating contract term (in months) 27 months 15 days 27 months 12 days