XML 36 R26.htm IDEA: XBRL DOCUMENT v3.10.0.1

MARKETABLE SECURITIES (Tables)

9 Months Ended

Sep. 30, 2018

Debt Securities, Available-for-sale [Abstract]

Schedule of net realized (losses) gains and reclassification of net realized (losses) gains from other comprehensive income

		Three months ended								Nine months ended
		September 30,								September 30,
(in thousands)		2018				2017				2018				2017
Net realized (loss) gain		$	(16	)		$	26			$	(36	)		$	38
Reclassification of net realized gains from other comprehensive income		$	(16	)		$	26			$	(36	)		$	38

Schedule of gross unrealized gains (losses) on marketable securities

		September 30, 2018								December 31, 2017
		Gross unrealized								Gross unrealized
(in thousands)		Gains				(Losses)				Gains				(Losses)
Municipal Obligations		$	0			$	(39	)		$	-			$	(70	)
Corporate Obligations			1				(10	)			-				-
		$	1			$	(49	)		$	-			$	(70	)

Schedule of amortized cost basis, fair value and net unrealized gains on available-for-sale securities

		September 30, 2018												December 31, 2017
Type of Securities		Amortized Cost Basis				Fair Value				Net Unrealized Losses				Amortized  Cost Basis				Fair  Value				Net  Unrealized  Losses
(in thousands)
Municipal Obligations		$	5,281			$	5,242			$	(39	)		$	13,101			$	13,031			$	(70	)
Corporate Obligations			10,934				10,925				(9	)			-				-				-
Total		$	16,215			$	16,167			$	(48	)		$	13,101			$	13,031			$	(70	)

X

- Definition

Tabular disclosure of net realized gains and the reclassification of net realized gains from other comprehensive income.

+ References

No definition available.

+ Details

Name:	mpx_ScheduleOfNetRealizedGainLossAndReclassificationTableTextBlock
Namespace Prefix:	mpx_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-URI http://asc.fasb.org/topic&trid=2196928

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration