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COMMITMENTS AND CONTINGENCIES (Detail Textuals) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Commitments and Contingencies Disclosure [Abstract] |  |  |
Rental expense for buildings, office, computer equipment | $ 1,127 | $ 1,570 | $ 1,346
Maximum repurchase collateral amount | $ 22,035 | $ 18,063 |

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- 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

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- Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
Name: | us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration