Significant Accounting Policies (Policies)	9 Months Ended
Significant Accounting Policies (Policies)	Sep. 30, 2012
Accounting Policies [Abstract]
Interim Financial Information	Interim Financial Information - The accompanying condensed consolidated financial statements of Micrel, Incorporated and its wholly-owned and majority-owned subsidiaries (together “Micrel” or the “Company”) as of September 30, 2012 and for the three and nine months ended September 30, 2012 and 2011 are unaudited. In the opinion of management, the condensed consolidated financial statements include all adjustments (consisting only of normal recurring accruals) that management considers necessary for a fair statement of its financial position, operating results, comprehensive income and cash flows for the interim periods presented. Operating results and cash flows for interim periods are not necessarily indicative of results for the entire year. The Condensed Consolidated Balance Sheet as of December 31, 2011, was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted (“GAAP”) in the United States of America. These financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2011. These financial statements should also be read in conjunction with the Company’s critical accounting policies included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2011 and those included in this Form 10-Q below.
Reclassifications	Effective January 1, 2012, the Company adopted the new standard that requires the presentation of comprehensive income, the components of net income and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. The new standard also requires presentation of adjustments for items that are reclassified from other comprehensive income to net income in the statement where the components of net income and the components of other comprehensive income are presented. In December 2011, an amendment was issued that defers the requirement to present reclassification adjustments out of accumulated other comprehensive income on the face of the consolidated statement of income. The adoption concerns presentation and disclosure only and did not have an impact on the Company’s consolidated financial position or results of operations.
Net Income Per Common and Equivalent Share	For the three and nine months ended September 30, 2012, 5.7 million stock options and 5.5 million stock options, respectively, have been excluded from the weighted-average number of common shares outstanding for the diluted net income per share computations as they were anti-dilutive. For the three and nine months ended September 30, 2011, 4.9 million stock options and 3.8 million stock options, respectively, have been excluded from the weighted-average number of common shares outstanding for the diluted net income per share computations as they were anti-dilutive.

Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.

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