v3.19.2
Document And Entity Information
Jul. 31, 2019
Document Information [Line Items]  
Entity Registrant Name MONOLITHIC POWER SYSTEMS INC
Document Type 8-K
Document Period End Date Jul. 31, 2019
Entity Incorporation, State or Country Code DE
Entity File Number 000-51026
Entity Tax Identification Number 77-0466789
Entity Address, Address Line One 4040 Lake Washington Blvd. NE, Suite 201
Entity Address, City or Town Kirkland
Entity Address, State or Province WA
Entity Address, Postal Zip Code 98033
City Area Code 425
Local Phone Number 296-9956
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 MPWR
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
Entity Ex Transition Period false
Amendment Flag false
Entity Central Index Key 0001280452