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COMMITMENTS AND CONTINGENCIES (Detail Textuals) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Commitments And Contingencies [Line Items] |  |  |
Rental expense for operating leases | $ 1,730 | $ 1,533 | $ 1,230
Maximum repurchase collateral amount | 45,196 | $ 38,334 |
Pennsylvania |  |  |
Commitments And Contingencies [Line Items] |  |  |
Estimated costs of project | 24,700 |  |
Capital cost incurred | 23,100 |  |
Ooltewah, Tennessee and Greeneville, Tennessee |  |  |
Commitments And Contingencies [Line Items] |  |  |
Estimated costs of project | 20,600 |  |
Capital cost incurred | 8,000 |  |
Current estimated costs of administrative building | $ 4,200 |  |

X
- Definition This element represents amount of capital cost incurred. + References No definition available. + Details
Name: | mlr_CapitalCostIncurred
Namespace Prefix: | mlr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line item represents information regarding commitments and contingencies. + References No definition available. + Details
Name: | mlr_CommitmentsAndContingenciesLineItems
Namespace Prefix: | mlr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents current estimated costs of administrative building. + References No definition available. + Details
Name: | mlr_CurrentEstimatedCostsOfAdministrativeBuilding
Namespace Prefix: | mlr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This element represents estimated cost of the project. + References No definition available. + Details
Name: | mlr_EstimatedCostsOfProject
Namespace Prefix: | mlr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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

X
- 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

X
- Details
Name: | us-gaap_StatementGeographicalAxis=mlr_PennsylvaniaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | mlr_FacilityAxis=mlr_OoltewahTennesseeAndGreenevilleTennesseeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |