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COMMITMENTS AND CONTINGENCIES - Right-of-use Assets (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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COMMITMENTS AND CONTINGENCIES: |
Finance lease right-of-use assets | $ 78
Accumulated amortization | (21)
Finance lease right-of-use assets, net | $ 57

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- Definition Represents the amount finance lease accumulated amortization. + References No definition available. + Details
Name: | mlr_FinanceLeaseAccumulatedAmortization
Namespace Prefix: | mlr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount represents finance lease right of use assets. + References No definition available. + Details
Name: | mlr_FinanceLeaseRightOfUseAssets
Namespace Prefix: | mlr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of lessee's right to use underlying asset under finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
Name: | us-gaap_FinanceLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant