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STOCK-BASED COMPENSATION, Equity Instruments Other Than Options (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Stock-based compensation, aggregate disclosures [Abstract]
Restricted stock awards and units vesting terms			2 years
Fair value of shares withheld for tax withholding obligations			$ 2,600,000	$ 3,000,000
Restricted Stock and Units [Member]
Equity instruments other than options [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			59,027
Stock-based compensation, aggregate disclosures [Abstract]
Restricted stock awards and units vesting terms			3 years
Shares withheld for tax withholding obligations (in shares)			75,314	94,087
Total fair value of performance unit awards granted			2,000,000
Restricted Stock and Units [Member] | Minimum [Member]
Stock-based compensation, aggregate disclosures [Abstract]
Restricted stock awards and units vesting terms			1 year
Restricted Stock and Units [Member] | Maximum [Member]
Stock-based compensation, aggregate disclosures [Abstract]
Restricted stock awards and units vesting terms			6 years
Restricted Stock and Units [Member] | Selling, General and Adminstrative Expense [Member]
Stock-based compensation, aggregate disclosures [Abstract]
Compensation expense	914,000	1,100,000	1,800,000	1,900,000
Restricted Stock and Units [Member] | Research and Development Expense [Member]
Stock-based compensation, aggregate disclosures [Abstract]
Compensation expense	409,000	417,000	783,000	744,000
Performance Shares [Member]
Equity instruments other than options [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			36,092
Stock-based compensation, aggregate disclosures [Abstract]
Total fair value of performance unit awards granted			1,400,000
Performance Shares [Member] | Selling, General and Adminstrative Expense [Member]
Stock-based compensation, aggregate disclosures [Abstract]
Compensation expense	198,000	137,000	685,000	175,000
Performance Shares [Member] | Research and Development Expense [Member]
Stock-based compensation, aggregate disclosures [Abstract]
Compensation expense	60,000	42,000	207,000	53,000
Non Employee Members of Scientific Advisory Board [Member] | Restricted Stock and Units [Member] | Research and Development Expense [Member]
Stock-based compensation, aggregate disclosures [Abstract]
Compensation expense	$ 57,000	$ 44,000	$ 100,000	$ 130,000
Performance-Based Vesting Requirement [Member] | Performance Shares [Member]
Equity instruments other than options [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			18,044
Market-Based Vesting Requirement [Member] | Performance Shares [Member]
Equity instruments other than options [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			18,048

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Total Grant Date Fair Value

+ References

No definition available.

+ Details

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

X

- Definition

The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

+ References

No definition available.

+ Details

Name:	us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

+ Details

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Balance Type:	debit
Period Type:	duration

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Balance Type:	na
Period Type:	duration

X

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
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- Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration