| Document And Entity Information | Oct. 31, 2019 |
| Document Information [Line Items] | |
| Entity Registrant Name | The New Home Company Inc. |
| Document Type | 8-K |
| Document Period End Date | Oct. 31, 2019 |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-36283 |
| Entity Tax Identification Number | 27-0560089 |
| Entity Address, Address Line One | 85 Enterprise, Suite 450 |
| Entity Address, City or Town | Aliso Viejo |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92656 |
| City Area Code | 949 |
| Local Phone Number | 382-7800 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | NWHM |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | true |
| Amendment Flag | false |
| Entity Central Index Key | 0001574596 |
