Name:	pke_ProceedsFromSaleOfTreasuryStockStockOptionsExercised
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Data Type:	xbrli:monetaryItemType
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The additional number of shares authorized, during the period, to be repurchased by an entity's Board of Directors under a stock repurchase plan.

No definition available.

Name:	pke_StockRepurchaseProgramNumberOfAdditionalSharesAuthorizedToBeRepurchased
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Data Type:	xbrli:sharesItemType
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Period Type:	duration

The percent of outstanding stock authorized to be repurchased

No definition available.

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Data Type:	num:percentItemType
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Period Type:	instant

Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.

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Name:	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
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Amount, after tax, of expense for award under share-based payment arrangement.

No definition available.

Name:	us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

Name:	us-gaap_CommonStockSharesOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Number of share options (or share units) exercised during the current period.

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Name:	us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

No definition available.

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Data Type:	xbrli:sharesItemType
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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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