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REVENUE AND LONG-LIVED ASSETS (Detail Textuals) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting [Abstract] |  |  |
Contract liability balances related to extended service contracts | $ 331 | $ 331 | $ 154
Increase in contract liabilities |  | $ 1,391 |
Settlement of contract liabilty | $ 1,214 |  |

X
- Definition Represents amount of contract liabilty settled. + References No definition available. + Details
Name: | mlr_ContractLiabilitySettled
Namespace Prefix: | mlr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of contract liability balances related to extended service contracts. + References No definition available. + Details
Name: | mlr_ServiceContractsContractLiability
Namespace Prefix: | mlr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInContractWithCustomerLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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