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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]      
NET INCOME $ 12,328 $ 33,860 $ 50,535
Other comprehensive income:      
Unrealized gains on investments 608 533 879
Income taxes 253 208 332
Other comprehensive income, net of taxes 355 325 547
COMPREHENSIVE INCOME 12,683 34,185 51,082
Less: comprehensive income attributable to the noncontrolling interest (10)      
COMPREHENSIVE INCOME ATTRIBUTABLE TO MICREL, INCORPORATED SHAREHOLDERS $ 12,673 $ 34,185 $ 51,082