COMMITMENTS AND CONTINGENCIES (Detail Textuals) (USD $) In Millions, unless otherwise specified			6 Months Ended
Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Capital Addition Purchase Commitments
Long-term Purchase Commitment [Line Items]
Maximum repurchase collateral amount	$ 24.8	$ 18.1
Commitment for construction and acquisiton of property, plant and equipment			$ 1.1

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

No definition available.

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