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Significant Accounting Policies Net Income Per Share (Details)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reconciliation of weighted-average shares used in computing net income per share      
Weighted average common shares outstanding 59,623,000 61,609,000 62,030,000
Dilutive effect of stock options outstanding using the treasury stock method 665,000 762,000 527,000
Shares used in computing diluted net income per share attributable to Micrel Incorporated shareholders 60,288,000 62,371,000 62,557,000
Stock options excluded from the weighted-average number of common shares outstanding for the diluted net income per share computations as they were anti-dilutive 5,200,000 4,100,000 4,000,000