COMMITMENTS AND CONTINGENCIES (Detail Textuals) (USD $) In Thousands, unless otherwise specified			6 Months Ended
Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Capital Addition Purchase Commitments
Long-term Purchase Commitment [Line Items]
Maximum repurchase collateral amount	$ 26,248	$ 22,035
Commitment for construction and acquisition of property, plant and equipment			$ 425

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:	debit
Period Type:	instant