v3.19.1
Document And Entity Information
12 Months Ended
Dec. 31, 2018
shares
Document Information [Line Items]  
Entity Registrant Name O2MICRO INTERNATIONAL LTD
Entity Central Index Key 0001095348
Trading Symbol oiim
Current Fiscal Year End Date --12-31
Entity Filer Category Non-accelerated Filer
Entity Current Reporting Status Yes
Entity Voluntary Filers Yes
Entity Well-known Seasoned Issuer No
Entity Emerging Growth Company false
Entity Common Stock, Shares Outstanding (in shares) 1,298,808,750
Document Type 20-F
Document Period End Date Dec. 31, 2018
Document Fiscal Year Focus 2018
Document Fiscal Period Focus FY
Amendment Flag false
Entity Shell Company false