Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2022	Apr. 30, 2022
Document Information Line Items
Entity Registrant Name	RUBICON TECHNOLOGY, INC.
Trading Symbol	RBCN
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		2,446,652
Amendment Flag	false
Entity Central Index Key	0001410172
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Document Period End Date	Mar. 31, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-33834
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-4419301
Entity Address, Address Line One	900 East Green Street
Entity Address, City or Town	Bensenville
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60106
City Area Code	(847)
Local Phone Number	295-7000
Title of 12(b) Security	Common Stock, par value $.001 per share
Security Exchange Name	NASDAQ
Entity Interactive Data Current	Yes