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Note N - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Apr. 05, 2016	Mar. 31, 2016	Mar. 18, 2016	Feb. 18, 2016
Maximum [Member]
Treasury Stock, Shares, Tender Offer			425,000	325,000
Treasury Stock Share Price, Tender Offer			$ 34	$ 30
Subsequent Event [Member]
Treasury Stock, Shares, Acquired	567,413
Treasury Stock Acquired, Average Cost Per Share	$ 31
Treasury Stock, Oversubscribed Shares Tendered	142,413
Treasury Stock, Value, Acquired, Cost Method	$ 17,600
Treasury Stock, Shares, Acquired		0
Treasury Stock, Value, Acquired, Cost Method		$ 122

X

- Definition

Number of oversubscribed shares tendered that have been repurchased during the period and are being held in treasury.

+ References

No definition available.

+ Details

Name:	ptsi_TreasuryStockOversubscribedSharesTendered
Namespace Prefix:	ptsi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Price of a single share of a treasury stock under the tender offer.

+ References

No definition available.

+ Details

Name:	ptsi_TreasuryStockSharePriceTenderOffer
Namespace Prefix:	ptsi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of shares that have been offered to be repurchased during the period and are being held in treasury.

+ References

No definition available.

+ Details

Name:	ptsi_TreasuryStockSharesTenderOffer
Namespace Prefix:	ptsi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

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

X

- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

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

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: