| Cover | Dec. 31, 2020 |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 31, 2020 |
| Entity File Number | 0-14939 |
| Entity Registrant Name | America's Car-Mart Inc. |
| Entity Central Index Key | 0000799850 |
| Entity Tax Identification Number | 63-0851141 |
| Entity Incorporation, State or Country Code | TX |
| Entity Address, Address Line One | 1805 North 2nd Street, Suite 401 |
| Entity Address, City or Town | Rogers |
| Entity Address, State or Province | AR |
| Entity Address, Postal Zip Code | 72756 |
| City Area Code | 479 |
| Local Phone Number | 464-9944 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | CRMT |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
