Name:	psmi_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
Namespace Prefix:	psmi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Financial instruments transfers between level one level two and level three securities.

No definition available.

Name:	psmi_FinancialInstrumentsTransfersBetweenLevelOneLevelTwoAndLevelThreeSecurities
Namespace Prefix:	psmi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Long term marketable securities maturity period.

No definition available.

Name:	psmi_LongTermMarketableSecuritiesMaturityPeriod
Namespace Prefix:	psmi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

Name:	us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Number of investment positions in available-for-sale investments in a continuous unrealized loss position for less than one year or normal operating cycle, if longer, for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

No definition available.