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COMMON STOCK AND STOCK-BASED COMPENSATION (Details)
1 Months Ended 9 Months Ended
Jul. 31, 2014
Jan. 31, 2015
2010 Stock Plan | Stock options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Annual award vesting percentage 33.30%mei_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardAnnualVestingPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= mei_TwoThousandTenStockPlanMember
 
Granted (in shares) 108,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= mei_TwoThousandTenStockPlanMember
 
Award expiration period 10 years  
2007 Stock Plan | Stock options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Annual award vesting percentage 33.30%mei_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardAnnualVestingPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= mei_TwoThousandSevenStockPlanMember
 
Granted (in shares) 50,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= mei_TwoThousandSevenStockPlanMember
 
Award expiration period 10 years  
2007 Stock Plan | Restricted Stock Awards (RSA's)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awarded (in shares)   13,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= mei_TwoThousandSevenStockPlanMember
2014 Stock Plan [Member] | Restricted Stock Awards (RSA's)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awarded (in shares)   13,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= mei_A2014StockPlanMember