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COMMITMENTS AND CONTINGENCIES (Detail Textuals) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Commitments And Contingencies [Line Items] |  |  |
Rental expense for operating leases | $ 1,937 | $ 1,736 | $ 1,730
Maximum repurchase collateral amount | 49,694 | $ 54,093 |
Capital Addition Purchase Commitments |  |  |
Commitments And Contingencies [Line Items] |  |  |
Commitment for construction and acquisition of property, plant and equipment | $ 7,053 |  |

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

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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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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |