Document And Entity Information - USD ($) $ in Millions	Dec. 31, 2021	Mar. 31, 2022	Jun. 30, 2021
Document Information [Line Items]
Entity, Registrant Name	BSQUARE CORP /WA
Document, Type	10-K/A
Document, Annual Report	true
Document, Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document, Fiscal Period Focus	FY
Document, Fiscal Year Focus	2021
Document, Transition Report	false
Entity, File Number	000-27687
Entity, Incorporation, State or Country Code	WA
Entity, Tax Identification Number	91-1650880
Entity, Address, Address Line One	1415 Western Ave, 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
Title of 12(b) Security	Common stock, no par value
Trading Symbol	BSQR
Security Exchange Name	NASDAQ
Entity, Well-known Seasoned Issuer	No
Entity, Voluntary Filers	No
Entity, Current Reporting Status	Yes
Entity, Interactive Data, Current	Yes
Entity, Filer Category	Non-accelerated Filer
Entity, Small Business	true
Entity, Emerging Growth Company	false
Entity, Shell Company	false
Entity, Public Float			$ 48
Entity, Common Stock Shares, Outstanding		20,445,880
Amendment Description	Bsquare Corporation (the “Company”) is filing this Amendment No. 1 on Form 10-K/A (“Form 10-K/A”) to the Annual Report on Form 10-K for the year ended December 31, 2021 (the “Original Filing”), which was filed with the U.S. Securities and Exchange Commission (the “SEC”) on March 10, 2022 (the “Original Filing Date”), solely to include the information required in Items 10-14 of Part III. The reference on the cover of the Original Filing to the incorporation by reference of the proxy statement related to the Company’s 2022 annual meeting of shareholders into Part III of the Original Filing is hereby deleted. In addition, as required by Rule 12b-15, promulgated under the Securities Exchange Act of 1934, as amended, new certifications pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 by the Company’s principal executive officer and principal financial officer are filed herewith as exhibits to this Form 10-K/A.   With the exception of the foregoing, this Form 10-K/A does not amend, modify, or otherwise update any other information in the Original Filing, including, without limitation, the financial statements. Accordingly, this Form 10-K/A should be read in conjunction with the Original Filing and our other filings with the SEC. In addition, this Form 10-K/A does not reflect events that may have occurred subsequent to the Original Filing Date.
Auditor Name	Moss Adams LLP
Auditor Location	Seattle, WA
Auditor Firm ID	659
Amendment Flag	true
Entity, Central Index Key	0001054721