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COMMITMENTS AND CONTINGENCIES (Detail Textuals) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Long-term Purchase Commitment [Line Items]
Maximum repurchase collateral amount	$ 40,047	$ 31,458
Cost incurred in Pennsylvania manufacturing operations	4,715
Capital Addition Purchase Commitments
Long-term Purchase Commitment [Line Items]
Commitment for construction and acquisition of property, plant and equipment	14,386
Pennsylvania
Long-term Purchase Commitment [Line Items]
Estimated cost of operations	22,700
Tennessee
Long-term Purchase Commitment [Line Items]
Estimated cost of operations	$ 10,000

X

- Definition

Represents amount of cost incurred in project.

+ References

No definition available.

+ Details

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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

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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

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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

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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

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- Details

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Namespace Prefix:
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X

- Details

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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Period Type: