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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	$ 522us-gaap_DefinedContributionPlanCostRecognized	$ 472us-gaap_DefinedContributionPlanCostRecognized	$ 424us-gaap_DefinedContributionPlanCostRecognized

X

- 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

X

- 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

X

- Details

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

X

- 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

X

- 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

X

- 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