This element represents the gain on the marketable securities which are unrealized.

No definition available.

Name:	mpx_MarketableSecuritiesUnrealizedGain
Namespace Prefix:	mpx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents the loss on the marketable securities which are unrealized.

+ References

No definition available.

+ Details

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Namespace Prefix:	mpx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 35
-Section 50
-Paragraph 1
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

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-Publisher FASB
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-Topic 230
-SubTopic 10
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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Date the dividend to be paid was declared, in CCYY-MM-DD format.

+ References

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- 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
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Period Type:	duration

- Definition

This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

+ References

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Balance Type:	credit
Period Type:	duration

- Definition

Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Carrying amount as of the balance sheet date of expenditures made in advance of when the economic benefit of the cost will be realized, and which will be expensed in future periods with the passage of time or when a triggering event occurs.

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Period Type:	instant

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SIGNIFICANT ACCOUNTING POLICIES (Detail Textuals 2) - USD ($)	1 Months Ended	12 Months Ended
	Jan. 27, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Significant Accounting Policies [Line Items]
Prepaid expenses related to unamortized product brochure costs		$ 282,000	$ 303,000
Net realized gains on marketable securities		45,000	57,000	$ 61,000
Reclassification of net realized gains from other comprehensive income		45,000	57,000	61,000
Gross unrealized gains on marketable securities		26,000	122,000
Gross unrealized losses on marketable securities		29,000	37,000
Selling, general and administrative expenses
Significant Accounting Policies [Line Items]
Advertising expenses		$ 2,480,000	$ 2,291,000	$ 2,113,000
Subsequent Event \| Dividend declared
Significant Accounting Policies [Line Items]
Amount of dividend payable in cash per share	$ 0.06
Dividends payable, date declared	Jan. 27, 2016
Dividend payable, date to be payable	Mar. 10, 2016
Dividends payable, date of record	Feb. 10, 2016