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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Detail Textuals 4) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of common stock issued from exercise of stock options 31,697us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 102,314us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 153,775us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised  
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Method used for fair value assumption of options granted       Black-Scholes option-pricing model
Expected dividend yield       0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Expected volatility rate       44.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Risk-free interest rate       1.71%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Expected life       4 years
Fair value of options granted       $ 1,596mlr_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueOfOptionsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Number of common stock issued from exercise of stock options 32,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
102,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
154,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember