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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Statement [Abstract]      
NET REVENUES $ 247,594us-gaap_SalesRevenueGoodsNet $ 237,080us-gaap_SalesRevenueGoodsNet $ 250,112us-gaap_SalesRevenueGoodsNet
COST OF REVENUES 119,566us-gaap_CostOfGoodsSold [1] 115,034us-gaap_CostOfGoodsSold [1] 117,185us-gaap_CostOfGoodsSold [1]
GROSS PROFIT 128,028us-gaap_GrossProfit 122,046us-gaap_GrossProfit 132,927us-gaap_GrossProfit
OPERATING EXPENSES:      
Research and development 62,033us-gaap_ResearchAndDevelopmentExpense [1] 55,853us-gaap_ResearchAndDevelopmentExpense [1] 57,182us-gaap_ResearchAndDevelopmentExpense [1]
Selling, general and administrative 48,351us-gaap_SellingGeneralAndAdministrativeExpense [1] 45,803us-gaap_SellingGeneralAndAdministrativeExpense [1] 48,010us-gaap_SellingGeneralAndAdministrativeExpense [1]
Restructuring charges 992us-gaap_RestructuringCharges 1,376us-gaap_RestructuringCharges 0us-gaap_RestructuringCharges
Total operating expenses 111,376us-gaap_OperatingExpenses 103,032us-gaap_OperatingExpenses 105,192us-gaap_OperatingExpenses
INCOME FROM OPERATIONS 16,652us-gaap_OperatingIncomeLoss 19,014us-gaap_OperatingIncomeLoss 27,735us-gaap_OperatingIncomeLoss
INTEREST AND OTHER INCOME (EXPENSE):      
Interest income 359us-gaap_InvestmentIncomeInterest 482us-gaap_InvestmentIncomeInterest 712us-gaap_InvestmentIncomeInterest
Other expense, net (297)us-gaap_OtherNonoperatingIncomeExpense (264)us-gaap_OtherNonoperatingIncomeExpense (153)us-gaap_OtherNonoperatingIncomeExpense
Total interest and other income, net 62us-gaap_InterestAndOtherIncome 218us-gaap_InterestAndOtherIncome 559us-gaap_InterestAndOtherIncome
INCOME BEFORE INCOME TAXES AND NONCONTROLLING INTEREST 16,714us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 19,232us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 28,294us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
PROVISION FOR INCOME TAXES 3,167us-gaap_IncomeTaxExpenseBenefit 1,584us-gaap_IncomeTaxExpenseBenefit 15,966us-gaap_IncomeTaxExpenseBenefit
NET INCOME 13,547us-gaap_ProfitLoss 17,648us-gaap_ProfitLoss 12,328us-gaap_ProfitLoss
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST 0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest   (10)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
NET INCOME ATTRIBUTABLE TO MICREL, INCORPORATED SHAREHOLDERS $ 13,547us-gaap_NetIncomeLoss $ 17,648us-gaap_NetIncomeLoss $ 12,318us-gaap_NetIncomeLoss
NET INCOME PER SHARE ATTRIBUTABLE TO MICREL, INCORPORATED SHAREHOLDERS:      
Basic $ 0.24us-gaap_EarningsPerShareBasic $ 0.31us-gaap_EarningsPerShareBasic $ 0.21us-gaap_EarningsPerShareBasic
Diluted $ 0.24us-gaap_EarningsPerShareDiluted $ 0.30us-gaap_EarningsPerShareDiluted $ 0.20us-gaap_EarningsPerShareDiluted
CASH DIVIDENDS DECLARED PER SHARE $ 0.20us-gaap_CommonStockDividendsPerShareDeclared $ 0.1425us-gaap_CommonStockDividendsPerShareDeclared $ 0.205us-gaap_CommonStockDividendsPerShareDeclared [2]
WEIGHTED AVERAGE SHARES USED IN COMPUTING PER SHARE AMOUNTS:      
Basic 56,508us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 57,803us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 59,623us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 57,538us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 58,506us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 60,288us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
[1] Share-based compensation expense included in:Cost of revenues$997 $1,060 $1,178Research and development3,197 2,875 3,132Selling, general and administrative3,430 3,162 3,282
[2] Included an accelerated cash dividend of $0.0425 per share of common stock totaling $2.5 million paid on December 27, 2012 to shareholders of record as of December 18, 2012.