COMMITMENTS AND CONTINGENCIES (Detail Textuals) (USD $) In Thousands, unless otherwise specified			3 Months Ended
Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Capital Addition Purchase Commitments
Long-term Purchase Commitment [Line Items]
Maximum repurchase collateral amount	$ 24,394	$ 22,035
Commitment for construction and acquisition of property, plant and equipment			$ 767

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