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EMPLOYEE BENEFIT PLANS - Restricted Stock (Details)	1 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage Of Monthly Payment Of Profits	7.00%	10.00%
2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation award, vesting period			5 years
Restricted shares of common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent			20.00%
Restricted shares of common stock | 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation award, vesting period			4 years

X

- Definition

This element represents the percentage of profits which used to calculate the monthly payment to each of the employees.

+ References

No definition available.

+ Details

Name:	mpx_PercentageOfMonthlyPaymentOfProfits
Namespace Prefix:	mpx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Vesting of Percentage.

+ References

No definition available.

+ Details

Name:	mpx_VestingPercentage
Namespace Prefix:	mpx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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