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COMMITMENTS AND CONTINGENCIES (Detail Textuals) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Long-term Purchase Commitment [Line Items]
Maximum repurchase collateral amount	$ 35,645mlr_ThresholdLimitForRepurchasesOfCollateralFromThirdPartyLenders	$ 31,458mlr_ThresholdLimitForRepurchasesOfCollateralFromThirdPartyLenders
Estimated cost of pennsylvania manufacturing operations	22,000mlr_EstimatedCostOfProject
Cost incurred in pennsylvania manufacturing operations	1,885mlr_CostsIncurredInProject
Capital Addition Purchase Commitments
Long-term Purchase Commitment [Line Items]
Commitment for construction and acquisition of property, plant and equipment	$ 2,382us-gaap_LongTermPurchaseCommitmentAmount / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = us-gaap_CapitalAdditionsMember

X

- Definition

Represents amount of cost incurred in project.

+ References

No definition available.

+ Details

Name:	mlr_CostsIncurredInProject
Namespace Prefix:	mlr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents amount of estimated cost of project.

+ References

No definition available.

+ Details

Name:	mlr_EstimatedCostOfProject
Namespace Prefix:	mlr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The maximum potential amount of collateral that the company could be required to purchase during the period.

+ References

No definition available.

+ Details

Name:	mlr_ThresholdLimitForRepurchasesOfCollateralFromThirdPartyLenders
Namespace Prefix:	mlr_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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

X

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=us-gaap_CapitalAdditionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: