| Document And Entity Information | Aug. 25, 2021 |
| Document Information [Line Items] | |
| Entity, Registrant Name | BLACKBOXSTOCKS INC. |
| Document, Type | 8-K |
| Document, Period End Date | Aug. 25, 2021 |
| Entity, Incorporation, State or Country Code | NV |
| Entity, File Number | 0-55108 |
| Entity, Tax Identification Number | 45-3598066 |
| Entity, Address, Address Line One | 5430 LBJ Freeway, Suite 1485 |
| Entity, Address, City or Town | Dallas |
| Entity, Address, State or Province | TX |
| Entity, Address, Postal Zip Code | 75240 |
| City Area Code | 972 |
| Local Phone Number | 726-9203 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity, Emerging Growth Company | true |
| Entity, Ex Transition Period | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0001567900 |
