| Document And Entity Information | May 10, 2024 |
| Document Information [Line Items] | |
| Entity Registrant Name | Harte Hanks, Inc. |
| Document Type | 8-K |
| Document Period End Date | May 10, 2024 |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 1-7120 |
| Entity Tax Identification Number | 74-1677284 |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | HHS |
| Security Exchange Name | NASDAQ |
| Amendment Flag | false |
| Entity Central Index Key | 0000045919 |
