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EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
EMPLOYEE BENEFIT PLANS
Period of completion of services for qualification of defined contribution plan	90 days	90 days	90 days
Defined contribution plan, percentage of employer matching contribution	50.00%	50.00%	50.00%
Defined contribution plan, percentage of participant contributions	5.00%	5.00%	5.00%
Employee contributions vesting period	5 years	5 years	5 years
Defined contribution plan, employer contribution	$ 1,179	$ 1,021	$ 1,030

X

- Definition

Represents employee contributions vesting period.

+ References

No definition available.

+ Details

Name:	mlr_DefinedContributionPlanEmployeeContributionsVestingPeriod
Namespace Prefix:	mlr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents period of completion of services for qualification of defined contribution plan.

+ References

No definition available.

+ Details

Name:	mlr_DefinedContributionPlanNumberOfCompletedPeriodOfServicesForQualificationForPlan
Namespace Prefix:	mlr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration