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COMMITMENTS AND CONTINGENCIES (Detail Textuals) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Capital Addition Purchase Commitments
Commitments and Contingencies Disclosure [Abstract]
Maximum repurchase collateral amount	$ 29,374	$ 31,854
Long-term Purchase Commitment [Line Items]
Commitment for construction and acquisition of property, plant and equipment			$ 462

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

- Details

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

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