Name:	ptsi_Note7CapitalStockDetailsLineItems
Namespace Prefix:	ptsi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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

+ References

No definition available.

+ Details

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

- Definition

The percent of outstanding stock, authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

Name:	ptsi_StockRepurchaseProgramAdditionalSharesAuthroizedToBeRepurchasedPercentOfOutstandingSharesPercent
Namespace Prefix:	ptsi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Cost per share of repurchased stock acquired.

+ References

No definition available.

+ Details

Name:	ptsi_TreasuryStockAcquiredCostPerShare
Namespace Prefix:	ptsi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Face amount or stated value per share of common stock.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5

+ Details

Name:	us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

+ Details

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

- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

+ Details

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

- Definition

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

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: 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 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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5

+ Details

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

- Definition

Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29

-Article 5

+ Details

Name:	us-gaap_PreferredStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29

-Article 5

+ Details

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

- Definition

Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29

-Article 5

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28,29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

+ Details

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

- Definition

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

+ References

+ Details

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

- Definition

The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656

+ Details

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

- 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: 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 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

Reference 4: 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

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

- Details

Name:	us-gaap_AcceleratedShareRepurchasesDateAxis=ptsi_November2014Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	us-gaap_ShareRepurchaseProgramAxis=ptsi_September2011AuthorizationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareRepurchaseProgramAxis=ptsi_September2011ReauthorizationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareRepurchaseProgramAxis=ptsi_The2013TenderOfferMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareRepurchaseProgramAxis=ptsi_The2014TenderOfferMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 7 - Capital Stock (Details) (USD $)	12 Months Ended		1 Months Ended		0 Months Ended		8 Months Ended	12 Months Ended
Note 7 - Capital Stock (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 30, 2014	Dec. 30, 2013	Nov. 30, 2014	Nov. 30, 2013	Dec. 31, 2014	Dec. 31, 2011	May 31, 2014
Note 7 - Capital Stock (Details) [Line Items]
Common Stock, Shares Authorized	40,000,000us-gaap_CommonStockSharesAuthorized	40,000,000us-gaap_CommonStockSharesAuthorized					40,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, Par or Stated Value Per Share (in Dollars per share)	$ 0.01	$ 0.01					0.01
Preferred Stock, Shares Authorized	10,000,000us-gaap_PreferredStockSharesAuthorized	10,000,000us-gaap_PreferredStockSharesAuthorized					10,000,000us-gaap_PreferredStockSharesAuthorized
Preferred Stock, Par or Stated Value Per Share (in Dollars per share)	$ 0.01	$ 0.01					0.01
Common Stock, Shares, Issued	11,474,096us-gaap_CommonStockSharesIssued	11,391,464us-gaap_CommonStockSharesIssued					11,474,096us-gaap_CommonStockSharesIssued
Common Stock, Shares, Outstanding	7,423,115us-gaap_CommonStockSharesOutstanding	7,983,539us-gaap_CommonStockSharesOutstanding					7,423,115us-gaap_CommonStockSharesOutstanding
Preferred Stock, Shares Issued	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued					0us-gaap_PreferredStockSharesIssued
Treasury Stock, Value, Acquired, Cost Method (in Dollars)	$ 30,810,000	$ 14,452,000
Treasury Stock, Shares	4,050,981us-gaap_TreasuryStockShares	3,407,925us-gaap_TreasuryStockShares					4,050,981us-gaap_TreasuryStockShares
Treasury Stock, Value (in Dollars)	82,501,000us-gaap_TreasuryStockValue	51,691,000us-gaap_TreasuryStockValue					82,501,000us-gaap_TreasuryStockValue
November2014Member
Note 7 - Capital Stock (Details) [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased					640,000
Minimum [Member] \| The 2014 Tender Offer [Member]
Note 7 - Capital Stock (Details) [Line Items]
Treasury Stock Acquired Cost Per Share (in Dollars per share)			$ 46.00
Minimum [Member] \| The 2013 Tender Offer [Member]
Note 7 - Capital Stock (Details) [Line Items]
Treasury Stock Acquired Cost Per Share (in Dollars per share)				$ 19.00
Maximum [Member] \| The 2014 Tender Offer [Member]
Note 7 - Capital Stock (Details) [Line Items]
Treasury Stock Acquired Cost Per Share (in Dollars per share)			$ 50.00
Maximum [Member] \| The 2013 Tender Offer [Member]
Note 7 - Capital Stock (Details) [Line Items]
Treasury Stock Acquired Cost Per Share (in Dollars per share)				$ 21.00
The 2014 Tender Offer [Member]
Note 7 - Capital Stock (Details) [Line Items]
Stock Repurchase Program, Additional Shares Authroized to Be Repurchased, Percent of Outstanding Shares, Percent					2.00%
Stock Repurchase Program, Additional Shares Authorized to Be Repurchased, Percent of Outstanding Shares, Shares					160,000
Treasury Stock Acquired Cost Per Share (in Dollars per share)			$ 50.00
Treasury Stock, Shares, Acquired			571,865
Treasury Stock, Value, Acquired, Cost Method (in Dollars)			28,700,000
The 2013 Tender Offer [Member]
Note 7 - Capital Stock (Details) [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased						600,000
Stock Repurchase Program, Additional Shares Authroized to Be Repurchased, Percent of Outstanding Shares, Percent						2.00%
Stock Repurchase Program, Additional Shares Authorized to Be Repurchased, Percent of Outstanding Shares, Shares						173,000
Treasury Stock Acquired Cost Per Share (in Dollars per share)				$ 20.50
Treasury Stock, Shares, Acquired				675,000
Treasury Stock, Value, Acquired, Cost Method (in Dollars)				$ 13,900,000
September 2011 Reauthorization [Member]
Note 7 - Capital Stock (Details) [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased									500,000
Treasury Stock, Shares, Acquired							33,341
September 2011 Authorization [Member]
Note 7 - Capital Stock (Details) [Line Items]
Treasury Stock, Shares, Acquired	37,850	50,325						224,000