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Note I - Capital Stock (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Apr. 30, 2015 | Apr. 30, 2014
Note I - Capital Stock (Details) [Line Items] |  |
Preferred Stock, Shares Authorized | 1,000,000 us-gaap_PreferredStockSharesAuthorized | 1,000,000 us-gaap_PreferredStockSharesAuthorized
Preferred Stock, Par or Stated Value Per Share (in Dollars per share) | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare
Preferred Stock, Shares Issued | 0 us-gaap_PreferredStockSharesIssued | 0 us-gaap_PreferredStockSharesIssued
Subsidiaries [Member] |  |
Note I - Capital Stock (Details) [Line Items] |  |
Preferred Stock, Par or Stated Value Per Share (in Dollars per share) | $ 1.00 us-gaap_PreferredStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Preferred Stock, Shares Issued | 500,000 us-gaap_PreferredStockSharesIssued / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Preferred Stock, Dividend Rate, Percentage | 8.00%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Preferred Stock, Right of Shareholder, Amount of Shares | 400,000 crmt_PreferredStockRightOfShareholderAmountOfShares / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Preferred Stock, Right to Shareholder, Value of Redeemed Stock (in Dollars) (in Dollars) | $ 400,000 crmt_PreferredStockRighttoShareholderValueofredeemedStock / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |

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- Definition Number of shares of preferred stock that a shareholder can require to redeem. + References No definition available. + Details
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- Definition The redemption (or callable) amount of redeemable preferred stock, excluding currently redeemable preferred stock. Excludes amounts representing dividends not declared or paid. + References No definition available. + Details
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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References No definition available. + Details
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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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