Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2022	Apr. 30, 2022
Document Information [Line Items]
Entity Central Index Key	0001054721
Entity Registrant Name	BSQUARE CORP /WA
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2022
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2022
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 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 Common Stock, Shares Outstanding		20,445,880