2.4.0.6 Html 406 440 1 true 153 0 false 10 false false R1.htm 000 - Disclosure - Document And Entity Information Sheet http://www.o2micro.com/role/DocumentAndEntityInformation Document And Entity Information true false R2.htm 001 - Statement - Consolidated Balance Sheets Sheet http://www.o2micro.com/role/ConsolidatedBalanceSheet Consolidated Balance Sheets false false R3.htm 002 - Statement - Consolidated Balance Sheets (Parentheticals) Sheet http://www.o2micro.com/role/ConsolidatedBalanceSheet_Parentheticals Consolidated Balance Sheets (Parentheticals) false false R4.htm 003 - Statement - Consolidated Statements of Operations and Comprehensive Income Sheet http://www.o2micro.com/role/ConsolidatedIncomeStatement Consolidated Statements of Operations and Comprehensive Income false false R5.htm 004 - Statement - Consolidated Statements of Shareholders' Equity Sheet http://www.o2micro.com/role/ShareholdersEquityType2or3 Consolidated Statements of Shareholders' Equity false false R6.htm 005 - Statement - Consolidated Statements of Cash Flows Sheet http://www.o2micro.com/role/ConsolidatedCashFlow Consolidated Statements of Cash Flows false false R7.htm 006 - Disclosure - Note 1 - General Sheet http://www.o2micro.com/role/Note Note 1 - General false false R8.htm 007 - Disclosure - Note 2 - Summary of Significant Accounting Policies Sheet http://www.o2micro.com/role/Note0 Note 2 - Summary of Significant Accounting Policies false false R9.htm 008 - Disclosure - Note 3 - Discontinued Operations And Exit Activities Sheet http://www.o2micro.com/role/Note00 Note 3 - Discontinued Operations And Exit Activities false false R10.htm 009 - Disclosure - Note 4 - Fair Value Measurements Sheet http://www.o2micro.com/role/Note000 Note 4 - Fair Value Measurements false false R11.htm 010 - Disclosure - Note 5 - Cash and Cash Equivalents Sheet http://www.o2micro.com/role/Note0000 Note 5 - Cash and Cash Equivalents false false R12.htm 011 - Disclosure - Note 6 - Short-Term Investments Sheet http://www.o2micro.com/role/Note00000 Note 6 - Short-Term Investments false false R13.htm 012 - Disclosure - Note 7 - Inventories Sheet http://www.o2micro.com/role/Note000000 Note 7 - Inventories false false R14.htm 013 - Disclosure - Note 8 - Prepaid Expenses and Other Current Assets Sheet http://www.o2micro.com/role/Note0000000 Note 8 - Prepaid Expenses and Other Current Assets false false R15.htm 014 - Disclosure - Note 9 - Long-Term Investments Sheet http://www.o2micro.com/role/Note00000000 Note 9 - Long-Term Investments false false R16.htm 015 - Disclosure - Note 10 - Property and Equipment, Net Sheet http://www.o2micro.com/role/Note000000000 Note 10 - Property and Equipment, Net false false R17.htm 016 - Disclosure - Note 11 - Intangible Assets, Net Sheet http://www.o2micro.com/role/Note0000000000 Note 11 - Intangible Assets, Net false false R18.htm 017 - Disclosure - Note 12 - Other Assets Sheet http://www.o2micro.com/role/Note00000000000 Note 12 - Other Assets false false R19.htm 018 - Disclosure - Note 13 - Accrued Expenses and Other Current Liabilities Sheet http://www.o2micro.com/role/Note000000000000 Note 13 - Accrued Expenses and Other Current Liabilities false false R20.htm 019 - Disclosure - Note 14 - Income Tax Sheet http://www.o2micro.com/role/Note0000000000000 Note 14 - Income Tax false false R21.htm 020 - Disclosure - Note 15 - Retirement and Pension Plans Sheet http://www.o2micro.com/role/Note00000000000000 Note 15 - Retirement and Pension Plans false false R22.htm 021 - Disclosure - Note 16 - Stock-Based Compensation Sheet http://www.o2micro.com/role/Note000000000000000 Note 16 - Stock-Based Compensation false false R23.htm 022 - Disclosure - Note 17 - Earnings (Loss) Per Share Sheet http://www.o2micro.com/role/Note0000000000000000 Note 17 - Earnings (Loss) Per Share false false R24.htm 023 - Disclosure - Note 18 - Commitments Sheet http://www.o2micro.com/role/Note00000000000000000 Note 18 - Commitments false false R25.htm 024 - Disclosure - Note 19 - Contingencies Sheet http://www.o2micro.com/role/Note000000000000000000 Note 19 - Contingencies false false R26.htm 025 - Disclosure - Note 20 - Financial Instruments Sheet http://www.o2micro.com/role/Note0000000000000000000 Note 20 - Financial Instruments false false R27.htm 026 - Disclosure - Note 21 - Segment Information Sheet http://www.o2micro.com/role/Note00000000000000000000 Note 21 - Segment Information false false R28.htm 027 - Disclosure - Accounting Policies, by Policy (Policies) Sheet http://www.o2micro.com/role/AccountingPoliciesByPolicy Accounting Policies, by Policy (Policies) false false R29.htm 028 - Disclosure - Note 4 - Fair Value Measurements (Tables) Sheet http://www.o2micro.com/role/NoteTables Note 4 - Fair Value Measurements (Tables) false false R30.htm 029 - Disclosure - Note 5 - Cash and Cash Equivalents (Tables) Sheet http://www.o2micro.com/role/NoteTables0 Note 5 - Cash and Cash Equivalents (Tables) false false R31.htm 030 - Disclosure - Note 6 - Short-Term Investments (Tables) Sheet http://www.o2micro.com/role/NoteTables00 Note 6 - Short-Term Investments (Tables) false false R32.htm 031 - Disclosure - Note 7 - Inventories (Tables) Sheet http://www.o2micro.com/role/NoteTables000 Note 7 - Inventories (Tables) false false R33.htm 032 - Disclosure - Note 8 - Prepaid Expenses and Other Current Assets (Tables) Sheet http://www.o2micro.com/role/NoteTables0000 Note 8 - Prepaid Expenses and Other Current Assets (Tables) false false R34.htm 033 - Disclosure - Note 9 - Long-Term Investments (Tables) Sheet http://www.o2micro.com/role/NoteTables00000 Note 9 - Long-Term Investments (Tables) false false R35.htm 034 - Disclosure - Note 10 - Property and Equipment, Net (Tables) Sheet http://www.o2micro.com/role/NoteTables000000 Note 10 - Property and Equipment, Net (Tables) false false R36.htm 035 - Disclosure - Note 11 - Intangible Assets, Net (Tables) Sheet http://www.o2micro.com/role/NoteTables0000000 Note 11 - Intangible Assets, Net (Tables) false false R37.htm 036 - Disclosure - Note 12 - Other Assets (Tables) Sheet http://www.o2micro.com/role/NoteTables00000000 Note 12 - Other Assets (Tables) false false R38.htm 037 - Disclosure - Note 13 - Accrued Expenses and Other Current Liabilities (Tables) Sheet http://www.o2micro.com/role/NoteTables000000000 Note 13 - Accrued Expenses and Other Current Liabilities (Tables) false false R39.htm 038 - Disclosure - Note 14 - Income Tax (Tables) Sheet http://www.o2micro.com/role/NoteTables0000000000 Note 14 - Income Tax (Tables) false false R40.htm 039 - Disclosure - Note 15 - Retirement and Pension Plans (Tables) Sheet http://www.o2micro.com/role/NoteTables00000000000 Note 15 - Retirement and Pension Plans (Tables) false false R41.htm 040 - Disclosure - Note 16 - Stock-Based Compensation (Tables) Sheet http://www.o2micro.com/role/NoteTables000000000000 Note 16 - Stock-Based Compensation (Tables) false false R42.htm 041 - Disclosure - Note 17 - Earnings (Loss) Per Share (Tables) Sheet http://www.o2micro.com/role/NoteTables0000000000000 Note 17 - Earnings (Loss) Per Share (Tables) false false R43.htm 042 - Disclosure - Note 18 - Commitments (Tables) Sheet http://www.o2micro.com/role/NoteTables00000000000000 Note 18 - Commitments (Tables) false false R44.htm 043 - Disclosure - Note 20 - Financial Instruments (Tables) Sheet http://www.o2micro.com/role/NoteTables000000000000000 Note 20 - Financial Instruments (Tables) false false R45.htm 044 - Disclosure - Note 21 - Segment Information (Tables) Sheet http://www.o2micro.com/role/NoteTables0000000000000000 Note 21 - Segment Information (Tables) false false R46.htm 046 - Disclosure - Note 2 - Summary of Significant Accounting Policies (Detail) Sheet http://www.o2micro.com/role/NoteDetail0 Note 2 - Summary of Significant Accounting Policies (Detail) false false R47.htm 047 - Disclosure - Note 3 - Discontinued Operations And Exit Activities (Detail) Sheet http://www.o2micro.com/role/NoteDetail00 Note 3 - Discontinued Operations And Exit Activities (Detail) false false R48.htm 048 - Disclosure - Note 4 - Fair Value Measurements (Detail) Sheet http://www.o2micro.com/role/NoteDetail000 Note 4 - Fair Value Measurements (Detail) false false R49.htm 049 - Disclosure - Note 4 - Fair Value Measurements (Detail) - Items Measured at Fair Value on a Recurring Basis Sheet http://www.o2micro.com/role/ItemsMeasuredatFairValueonaRecurringBasisTable Note 4 - Fair Value Measurements (Detail) - Items Measured at Fair Value on a Recurring Basis false false R50.htm 051 - Disclosure - Note 5 - Cash and Cash Equivalents (Detail) - Summary of cash and cash equivalents Sheet http://www.o2micro.com/role/SummaryofcashandcashequivalentsTable Note 5 - Cash and Cash Equivalents (Detail) - Summary of cash and cash equivalents false false R51.htm 052 - Disclosure - Note 6 - Short-Term Investments (Detail) Sheet http://www.o2micro.com/role/NoteDetail00000 Note 6 - Short-Term Investments (Detail) false false R52.htm 053 - Disclosure - Note 6 - Short-Term Investments (Detail) - Summary of Short-Term Investments Sheet http://www.o2micro.com/role/SummaryofShortTermInvestmentsTable Note 6 - Short-Term Investments (Detail) - Summary of Short-Term Investments false false R53.htm 054 - Disclosure - Note 6 - Short-Term Investments (Detail) - Summary of Short-Term Investments by Contractual Maturity Sheet http://www.o2micro.com/role/SummaryofShortTermInvestmentsbyContractualMaturityTable Note 6 - Short-Term Investments (Detail) - Summary of Short-Term Investments by Contractual Maturity false false R54.htm 055 - Disclosure - Note 6 - Short-Term Investments (Detail) - Summary of Unrealized Losses and Fair Value of Investments Not Deemed to be Other Than Temporarily Impaired Sheet http://www.o2micro.com/role/SummaryofUnrealizedLossesandFairValueofInvestmentsNotDeemedtobeOtherThanTemporarilyImpairedTable Note 6 - Short-Term Investments (Detail) - Summary of Unrealized Losses and Fair Value of Investments Not Deemed to be Other Than Temporarily Impaired false false R55.htm 057 - Disclosure - Note 7 - Inventories (Detail) - Summary of Inventory Sheet http://www.o2micro.com/role/SummaryofInventoryTable Note 7 - Inventories (Detail) - Summary of Inventory false false R56.htm 059 - Disclosure - Note 8 - Prepaid Expenses and Other Current Assets (Detail) - Summary of Prepaid Expenses and Other Current Assets Sheet http://www.o2micro.com/role/SummaryofPrepaidExpensesandOtherCurrentAssetsTable Note 8 - Prepaid Expenses and Other Current Assets (Detail) - Summary of Prepaid Expenses and Other Current Assets false false R57.htm 060 - Disclosure - Note 9 - Long-Term Investments (Detail) Sheet http://www.o2micro.com/role/NoteDetail00000000 Note 9 - Long-Term Investments (Detail) false false R58.htm 061 - Disclosure - Note 9 - Long-Term Investments (Detail) - Summary of Long-Term Investments Sheet http://www.o2micro.com/role/SummaryofLongTermInvestmentsTable Note 9 - Long-Term Investments (Detail) - Summary of Long-Term Investments false false R59.htm 062 - Disclosure - Note 9 - Long-Term Investments (Detail) - Summary of Gross Unrealized Gains and Losses and Fair Value of Long-Term Investments in Available-For-Sale Securities Sheet http://www.o2micro.com/role/SummaryofGrossUnrealizedGainsandLossesandFairValueofLongTermInvestmentsinAvailableForSaleSecuritiesTable Note 9 - Long-Term Investments (Detail) - Summary of Gross Unrealized Gains and Losses and Fair Value of Long-Term Investments in Available-For-Sale Securities false false R60.htm 063 - Disclosure - Note 10 - Property and Equipment, Net (Detail) Sheet http://www.o2micro.com/role/NoteDetail000000000 Note 10 - Property and Equipment, Net (Detail) false false R61.htm 064 - Disclosure - Note 10 - Property and Equipment, Net (Detail) - Summary of Property and Equipment, Net Sheet http://www.o2micro.com/role/SummaryofPropertyandEquipmentNetTable Note 10 - Property and Equipment, Net (Detail) - Summary of Property and Equipment, Net false false R62.htm 065 - Disclosure - Note 11 - Intangible Assets, Net (Detail) Sheet http://www.o2micro.com/role/NoteDetail0000000000 Note 11 - Intangible Assets, Net (Detail) false false R63.htm 066 - Disclosure - Note 11 - Intangible Assets, Net (Detail) - Summary of Intangible Assets Sheet http://www.o2micro.com/role/SummaryofIntangibleAssetsTable Note 11 - Intangible Assets, Net (Detail) - Summary of Intangible Assets false false R64.htm 067 - Disclosure - Note 11 - Intangible Assets, Net (Detail) - Intangible assets consisted of the following as of December 31, 2011: Sheet http://www.o2micro.com/role/IntangibleassetsconsistedofthefollowingasofDecember312011Table Note 11 - Intangible Assets, Net (Detail) - Intangible assets consisted of the following as of December 31, 2011: false false R65.htm 068 - Disclosure - Note 12 - Other Assets (Detail) Sheet http://www.o2micro.com/role/NoteDetail00000000000 Note 12 - Other Assets (Detail) false false R66.htm 069 - Disclosure - Note 12 - Other Assets (Detail) - Summary of Other Assets Sheet http://www.o2micro.com/role/SummaryofOtherAssetsTable Note 12 - Other Assets (Detail) - Summary of Other Assets false false R67.htm 071 - Disclosure - Note 13 - Accrued Expenses and Other Current Liabilities (Detail) - Summary of Accrued Expenses and Other Current Liabilities Sheet http://www.o2micro.com/role/SummaryofAccruedExpensesandOtherCurrentLiabilitiesTable Note 13 - Accrued Expenses and Other Current Liabilities (Detail) - Summary of Accrued Expenses and Other Current Liabilities false false R68.htm 072 - Disclosure - Note 14 - Income Tax (Detail) Sheet http://www.o2micro.com/role/NoteDetail0000000000000 Note 14 - Income Tax (Detail) false false R69.htm 073 - Disclosure - Note 14 - Income Tax (Detail) - Summary of Income (Loss) Before Income Taxes From Continuing Operations Sheet http://www.o2micro.com/role/SummaryofIncomeLossBeforeIncomeTaxesFromContinuingOperationsTable Note 14 - Income Tax (Detail) - Summary of Income (Loss) Before Income Taxes From Continuing Operations false false R70.htm 074 - Disclosure - Note 14 - Income Tax (Detail) - Summary of Income Tax Expense From Continuing Operations Sheet http://www.o2micro.com/role/SummaryofIncomeTaxExpenseFromContinuingOperationsTable Note 14 - Income Tax (Detail) - Summary of Income Tax Expense From Continuing Operations false false R71.htm 075 - Disclosure - Note 14 - Income Tax (Detail) - Reconciliation Between Statutory Income Tax Rate and The Effective Income Tax Rate Sheet http://www.o2micro.com/role/ReconciliationBetweenStatutoryIncomeTaxRateandTheEffectiveIncomeTaxRateTable Note 14 - Income Tax (Detail) - Reconciliation Between Statutory Income Tax Rate and The Effective Income Tax Rate false false R72.htm 076 - Disclosure - Note 14 - Income Tax (Detail) - Summary of Deferred Tax Assets and Liabilities Sheet http://www.o2micro.com/role/SummaryofDeferredTaxAssetsandLiabilitiesTable Note 14 - Income Tax (Detail) - Summary of Deferred Tax Assets and Liabilities false false R73.htm 077 - Disclosure - Note 14 - Income Tax (Detail) - Reconciliation of the Beginning and Ending Unrecognized Tax Benefits Sheet http://www.o2micro.com/role/ReconciliationoftheBeginningandEndingUnrecognizedTaxBenefitsTable Note 14 - Income Tax (Detail) - Reconciliation of the Beginning and Ending Unrecognized Tax Benefits false false R74.htm 078 - Disclosure - Note 15 - Retirement and Pension Plans (Detail) Sheet http://www.o2micro.com/role/NoteDetail00000000000000 Note 15 - Retirement and Pension Plans (Detail) false false R75.htm 079 - Disclosure - Note 15 - Retirement and Pension Plans (Detail) - The percentage of major category of plan assets Sheet http://www.o2micro.com/role/ThepercentageofmajorcategoryofplanassetsTable Note 15 - Retirement and Pension Plans (Detail) - The percentage of major category of plan assets false false R76.htm 080 - Disclosure - Note 15 - Retirement and Pension Plans (Detail) - Changes in Projected Benefit Obligation and Plan Assets Sheet http://www.o2micro.com/role/ChangesinProjectedBenefitObligationandPlanAssetsTable Note 15 - Retirement and Pension Plans (Detail) - Changes in Projected Benefit Obligation and Plan Assets false false R77.htm 081 - Disclosure - Note 15 - Retirement and Pension Plans (Detail) - Summary of Net Periodic Benefit Cost Sheet http://www.o2micro.com/role/SummaryofNetPeriodicBenefitCostTable Note 15 - Retirement and Pension Plans (Detail) - Summary of Net Periodic Benefit Cost false false R78.htm 082 - Disclosure - Note 15 - Retirement and Pension Plans (Detail) - Summary of Funded Status of the Plan Sheet http://www.o2micro.com/role/SummaryofFundedStatusofthePlanTable Note 15 - Retirement and Pension Plans (Detail) - Summary of Funded Status of the Plan false false R79.htm 083 - Disclosure - Note 15 - Retirement and Pension Plans (Detail) - The actuarial assumptions to determine the benefit obligations were as follows Sheet http://www.o2micro.com/role/TheactuarialassumptionstodeterminethebenefitobligationswereasfollowsTable Note 15 - Retirement and Pension Plans (Detail) - The actuarial assumptions to determine the benefit obligations were as follows false false R80.htm 084 - Disclosure - Note 15 - Retirement and Pension Plans (Detail) - The Actuarial Assumptions to Determine the Net Periodic Benefit Cost Sheet http://www.o2micro.com/role/TheActuarialAssumptionstoDeterminetheNetPeriodicBenefitCostTable Note 15 - Retirement and Pension Plans (Detail) - The Actuarial Assumptions to Determine the Net Periodic Benefit Cost false false R81.htm 085 - Disclosure - Note 15 - Retirement and Pension Plans (Detail) - Summary of Estimated Future Benefit Payments Sheet http://www.o2micro.com/role/SummaryofEstimatedFutureBenefitPaymentsTable Note 15 - Retirement and Pension Plans (Detail) - Summary of Estimated Future Benefit Payments false false R82.htm 086 - Disclosure - Note 16 - Stock-Based Compensation (Detail) Sheet http://www.o2micro.com/role/NoteDetail000000000000000 Note 16 - Stock-Based Compensation (Detail) false false R83.htm 087 - Disclosure - Note 16 - Stock-Based Compensation (Detail) - A Summary of Company’s Stock Option Activity Under the Plans Sheet http://www.o2micro.com/role/ASummaryofCompanysStockOptionActivityUnderthePlansTable Note 16 - Stock-Based Compensation (Detail) - A Summary of Company’s Stock Option Activity Under the Plans false false R84.htm 088 - Disclosure - Note 16 - Stock-Based Compensation (Detail) - Table Summarizes Information About Outstanding and Vested Stock Options Sheet http://www.o2micro.com/role/TableSummarizesInformationAboutOutstandingandVestedStockOptionsTable Note 16 - Stock-Based Compensation (Detail) - Table Summarizes Information About Outstanding and Vested Stock Options false false R85.htm 089 - Disclosure - Note 16 - Stock-Based Compensation (Detail) - A Summary of the Status and Changes of the Company’s RSUs Sheet http://www.o2micro.com/role/ASummaryoftheStatusandChangesoftheCompanysRSUsTable Note 16 - Stock-Based Compensation (Detail) - A Summary of the Status and Changes of the Company’s RSUs false false R86.htm 090 - Disclosure - Note 16 - Stock-Based Compensation (Detail) - Summary of Assumptions to Determine Fair Value of Stock Options and ESOP Sheet http://www.o2micro.com/role/SummaryofAssumptionstoDetermineFairValueofStockOptionsandESOPTable Note 16 - Stock-Based Compensation (Detail) - Summary of Assumptions to Determine Fair Value of Stock Options and ESOP false false R87.htm 091 - Disclosure - Note 16 - Stock-Based Compensation (Detail) - Summary of Ordinary Shares Reserved For Future Issuance Sheet http://www.o2micro.com/role/SummaryofOrdinarySharesReservedForFutureIssuanceTable Note 16 - Stock-Based Compensation (Detail) - Summary of Ordinary Shares Reserved For Future Issuance false false R88.htm 092 - Disclosure - Note 17 - Earnings (Loss) Per Share (Detail) Sheet http://www.o2micro.com/role/NoteDetail0000000000000000 Note 17 - Earnings (Loss) Per Share (Detail) false false R89.htm 093 - Disclosure - Note 17 - Earnings (Loss) Per Share (Detail) - Reconciliation of the Numerator and Denominator of Basic and Diluted Earnings (Loss) Per Share Sheet http://www.o2micro.com/role/ReconciliationoftheNumeratorandDenominatorofBasicandDilutedEarningsLossPerShareTable Note 17 - Earnings (Loss) Per Share (Detail) - Reconciliation of the Numerator and Denominator of Basic and Diluted Earnings (Loss) Per Share false false R90.htm 094 - Disclosure - Note 18 - Commitments (Detail) Sheet http://www.o2micro.com/role/NoteDetail00000000000000000 Note 18 - Commitments (Detail) false false R91.htm 095 - Disclosure - Note 18 - Commitments (Detail) - Summary Of Future Minimum Lease Payments For All Noncancelable Operating Leases Sheet http://www.o2micro.com/role/SummaryOfFutureMinimumLeasePaymentsForAllNoncancelableOperatingLeasesTable Note 18 - Commitments (Detail) - Summary Of Future Minimum Lease Payments For All Noncancelable Operating Leases false false R92.htm 096 - Disclosure - Note 18 - Commitments (Detail) - Summary of purchase commitments Sheet http://www.o2micro.com/role/SummaryofpurchasecommitmentsTable Note 18 - Commitments (Detail) - Summary of purchase commitments false false R93.htm 097 - Disclosure - Note 19 - Contingencies (Detail) Sheet http://www.o2micro.com/role/NoteDetail000000000000000000 Note 19 - Contingencies (Detail) false false R94.htm 099 - Disclosure - Note 20 - Financial Instruments (Detail) - Summary of Company Financial Instruments Sheet http://www.o2micro.com/role/SummaryofCompanyFinancialInstrumentsTable Note 20 - Financial Instruments (Detail) - Summary of Company Financial Instruments false false R95.htm 100 - Disclosure - Note 21 - Segment Information (Detail) Sheet http://www.o2micro.com/role/NoteDetail00000000000000000000 Note 21 - Segment Information (Detail) false false R96.htm 101 - Disclosure - Note 21 - Segment Information (Detail) - Summary of Operating Segment net Sales and Operating Income (Loss) Sheet http://www.o2micro.com/role/SummaryofOperatingSegmentnetSalesandOperatingIncomeLossTable Note 21 - Segment Information (Detail) - Summary of Operating Segment net Sales and Operating Income (Loss) false false R97.htm 102 - Disclosure - Note 21 - Segment Information (Detail) - Summary of Net Sales to Unaffiliated Customers by Geographic Region Sheet http://www.o2micro.com/role/SummaryofNetSalestoUnaffiliatedCustomersbyGeographicRegionTable Note 21 - Segment Information (Detail) - Summary of Net Sales to Unaffiliated Customers by Geographic Region false false R98.htm 103 - Disclosure - Note 21 - Segment Information (Detail) - Percentage of net sales to major customer Sheet http://www.o2micro.com/role/PercentageofnetsalestomajorcustomerTable Note 21 - Segment Information (Detail) - Percentage of net sales to major customer false false R99.htm 104 - Disclosure - Note 21 - Segment Information (Detail) - Summary of Long Lived Assets by Physical Location Sheet http://www.o2micro.com/role/SummaryofLongLivedAssetsbyPhysicalLocationTable Note 21 - Segment Information (Detail) - Summary of Long Lived Assets by Physical Location false false All Reports Book All Reports Element us-gaap_AssetImpairmentCharges had a mix of decimals attribute values: -3 0. Element us-gaap_CommonStockParOrStatedValuePerShare had a mix of decimals attribute values: 2 5. Element us-gaap_EntityWideRevenueMajorCustomerPercentage had a mix of decimals attribute values: 2 3. Element us-gaap_ImpairmentOfIntangibleAssetsFinitelived had a mix of decimals attribute values: -3 0. Element us-gaap_UnrecognizedTaxBenefits had a mix of decimals attribute values: -3 0. 'Monetary' elements on report '003 - Statement - Consolidated Statements of Operations and Comprehensive Income' had a mix of different decimal attribute values. 'Monetary' elements on report '061 - Disclosure - Note 9 - Long-Term Investments (Detail) - Summary of Long-Term Investments' had a mix of different decimal attribute values. 'Monetary' elements on report '066 - Disclosure - Note 11 - Intangible Assets, Net (Detail) - Summary of Intangible Assets' had a mix of different decimal attribute values. Process Flow-Through: 001 - Statement - Consolidated Balance Sheets Process Flow-Through: Removing column 'Dec. 31, 2010' Process Flow-Through: Removing column 'Dec. 31, 2009' Process Flow-Through: 002 - Statement - Consolidated Balance Sheets (Parentheticals) Process Flow-Through: 003 - Statement - Consolidated Statements of Operations and Comprehensive Income Process Flow-Through: Removing column '24 Months Ended Dec. 31, 2012' Process Flow-Through: 005 - Statement - Consolidated Statements of Cash Flows Process Flow-Through: Removing column '24 Months Ended Dec. 31, 2012' oiim-20121231.xml oiim-20121231.xsd oiim-20121231_cal.xml oiim-20121231_def.xml oiim-20121231_lab.xml oiim-20121231_pre.xml true true