| Document And Entity Information | Oct. 17, 2022 |
| Document Information [Line Items] | |
| Entity, Registrant Name | BSQUARE CORP /WA |
| Document, Type | 8-K |
| Document, Period End Date | Oct. 17, 2022 |
| Entity, Incorporation, State or Country Code | WA |
| Entity, File Number | 000-27687 |
| Entity, Tax Identification Number | 91-1650880 |
| Entity, Address, Address Line One | 1415 Western Avenue, Suite 700 |
| Entity, Address, City or Town | Seattle |
| Entity, Address, State or Province | WA |
| Entity, Address, Postal Zip Code | 98101 |
| City Area Code | 425 |
| Local Phone Number | 519-5900 |
| 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 | BSQR |
| Security Exchange Name | NASDAQ |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0001054721 |
