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v3.20.2

SUBSEQUENT EVENT (Details) | Jul. 28, 2020 $ / shares
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SUBSEQUENT EVENTS |
Special cash dividend Payable, Amount Per Share | $ 0.08
Dividend payable, date to be payable | Sep. 10, 2020
Dividends payable, date of record | Aug. 10, 2020

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- Definition The per share amount of a dividend payable as of the financial reporting date. + References No definition available. + Details
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Namespace Prefix: | mpx_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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