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EMPLOYEE BENEFIT PLANS (Detail Textuals) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract] |  |  |
Period of completion of services for qualification of defined contribution plan | 90 days |  |
Defined contribution plan, percentage of employer matching contribution | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Defined contribution plan, percentage of participant contributions | 5.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent | 5.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent | 5.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Employee contributions vesting period | over the first five years of employment |  |
Defined contribution plan, employer contribution | $ 522 us-gaap_DefinedContributionPlanCostRecognized | $ 472 us-gaap_DefinedContributionPlanCostRecognized | $ 424 us-gaap_DefinedContributionPlanCostRecognized

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- Definition Represents employee contributions vesting period. + References No definition available. + Details
Name: | mlr_DefinedContributionPlanEmployeeContributionsVestingPeriod
Namespace Prefix: | mlr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents period of completion of services for qualification of defined contribution plan. + References No definition available. + Details
Name: | mlr_DefinedContributionPlanNumberOfCompletedPeriodOfServicesForQualificationForPlan
Namespace Prefix: | mlr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration