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COMMITMENTS AND CONTINGENCIES (Detail Textuals) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Long-term Purchase Commitment [Line Items]
Maximum repurchase collateral amount	$ 54,546	$ 54,093
Capital Addition Purchase Commitments
Long-term Purchase Commitment [Line Items]
Commitment for construction and acquisition of property, plant and equipment	7,080
Commitments related to construction of administrative building	1,000
Tennessee
Long-term Purchase Commitment [Line Items]
Capital cost incurred	3,200
Current estimated costs of administrative building	$ 4,200

X

- Definition

This element represents amount of capital cost incurred.

+ References

No definition available.

+ Details

Name:	mlr_CapitalCostIncurred
Namespace Prefix:	mlr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

This element represents amount of commitments related to construction of administrative building.

+ References

No definition available.

+ Details

Name:	mlr_CommitmentsRelatedToConstructionOfAdministrativeBuilding
Namespace Prefix:	mlr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents current estimated costs of administrative building.

+ References

No definition available.

+ Details

Name:	mlr_CurrentEstimatedCostsOfAdministrativeBuilding
Namespace Prefix:	mlr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ 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:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_TN
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: