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SIGNIFICANT ACCOUNTING POLICIES (Detail Textuals) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Segment | Dec. 31, 2013 | Dec. 31, 2012
Concentration Risk [Line Items] |  |  |
Number of reportable segment | 1 us-gaap_NumberOfReportableSegments |  |
Net sales from all dealers | $ 171,050 us-gaap_SalesRevenueNet | $ 168,293 us-gaap_SalesRevenueNet | $ 148,950 us-gaap_SalesRevenueNet
Net Sales | International Dealer |  |  |
Concentration Risk [Line Items] |  |  |
Net sales from all dealers | $ 26,000 us-gaap_SalesRevenueNet / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / mpx_DealerAxis = mpx_InternationalDealerMember | $ 29,000 us-gaap_SalesRevenueNet / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / mpx_DealerAxis = mpx_InternationalDealerMember | $ 30,000 us-gaap_SalesRevenueNet / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / mpx_DealerAxis = mpx_InternationalDealerMember
Net Sales | Customer Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, customer | No single dealer accounted for more than 10 percent of net sales | No single dealer accounted for more than 10 percent of net sales | No single dealer accounted for more than 10 percent of net sales
Concentration risk, benchmark description | more than 10 percent | more than 10 percent | more than 10 percent

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- Definition Identifies or describes the benchmark that serves as the denominator in the calculation of the percentage of concentration risk. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6327-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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