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Commitments and Contingencies (Details) (USD $)
 12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2007
Dec. 31, 2006
Jun. 30, 2012
Mar. 31, 2012
Loss Contingencies [Line Items]              
Nadatel purchased low-dropout voltage regulators       17,000mcrl_PurchaseOfMachinery 17,000mcrl_PurchaseOfMachinery    
2015 $ 960,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent            
2016 526,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears            
2017 420,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears            
2018 120,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears            
2019 21,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears            
Total 2,047,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue            
Rent expense under operating leases 1,100,000us-gaap_LeaseAndRentalExpense 1,100,000us-gaap_LeaseAndRentalExpense 1,100,000us-gaap_LeaseAndRentalExpense        
Open purchase orders 19,400,000us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted            
Letters of credit outstanding 300,000us-gaap_LettersOfCreditOutstandingAmount            
Selling, general and administrative [Member]              
Loss Contingencies [Line Items]              
Settlement expense           $ 200,000us-gaap_LitigationSettlementExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 $ 200,000us-gaap_LitigationSettlementExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember