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Note 7 - Capital Stock (Details) (USD $) | 12 Months Ended | 1 Months Ended | 0 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
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 | 40,000,000 us-gaap_CommonStockSharesAuthorized | 40,000,000 us-gaap_CommonStockSharesAuthorized |  |  |  |  | 40,000,000 us-gaap_CommonStockSharesAuthorized |  |
Common Stock, Par or Stated Value Per Share (in Dollars per share) | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  |  | 0.01 us-gaap_CommonStockParOrStatedValuePerShare |  |
Preferred Stock, Shares Authorized | 10,000,000 us-gaap_PreferredStockSharesAuthorized | 10,000,000 us-gaap_PreferredStockSharesAuthorized |  |  |  |  | 10,000,000 us-gaap_PreferredStockSharesAuthorized |  |
Preferred Stock, Par or Stated Value Per Share (in Dollars per share) | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare |  |  |  |  | 0.01 us-gaap_PreferredStockParOrStatedValuePerShare |  |
Common Stock, Shares, Issued | 11,474,096 us-gaap_CommonStockSharesIssued | 11,391,464 us-gaap_CommonStockSharesIssued |  |  |  |  | 11,474,096 us-gaap_CommonStockSharesIssued |  |
Common Stock, Shares, Outstanding | 7,423,115 us-gaap_CommonStockSharesOutstanding | 7,983,539 us-gaap_CommonStockSharesOutstanding |  |  |  |  | 7,423,115 us-gaap_CommonStockSharesOutstanding |  |
Preferred Stock, Shares Issued | 0 us-gaap_PreferredStockSharesIssued | 0 us-gaap_PreferredStockSharesIssued |  |  |  |  | 0 us-gaap_PreferredStockSharesIssued |  |
Treasury Stock, Value, Acquired, Cost Method (in Dollars) | $ 30,810,000 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 14,452,000 us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  |  |  |
Treasury Stock, Shares | 4,050,981 us-gaap_TreasuryStockShares | 3,407,925 us-gaap_TreasuryStockShares |  |  |  |  | 4,050,981 us-gaap_TreasuryStockShares |  |
Treasury Stock, Value (in Dollars) | 82,501,000 us-gaap_TreasuryStockValue | 51,691,000 us-gaap_TreasuryStockValue |  |  |  |  | 82,501,000 us-gaap_TreasuryStockValue |  |
November2014Member |  |  |  |  |  |  |  |  |
Note 7 - Capital Stock (Details) [Line Items] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  | 640,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_AcceleratedShareRepurchasesDateAxis = ptsi_November2014Member |  |  |  |
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 ptsi_TreasuryStockAcquiredCostPerShare / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ShareRepurchaseProgramAxis = ptsi_The2014TenderOfferMember |  |  |  |  |  |
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 ptsi_TreasuryStockAcquiredCostPerShare / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ShareRepurchaseProgramAxis = ptsi_The2013TenderOfferMember |  |  |  |  |
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 ptsi_TreasuryStockAcquiredCostPerShare / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ShareRepurchaseProgramAxis = ptsi_The2014TenderOfferMember |  |  |  |  |  |
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 ptsi_TreasuryStockAcquiredCostPerShare / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ShareRepurchaseProgramAxis = ptsi_The2013TenderOfferMember |  |  |  |  |
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%ptsi_StockRepurchaseProgramAdditionalSharesAuthroizedToBeRepurchasedPercentOfOutstandingSharesPercent / us-gaap_ShareRepurchaseProgramAxis = ptsi_The2014TenderOfferMember |  |  |  |
Stock Repurchase Program, Additional Shares Authorized to Be Repurchased, Percent of Outstanding Shares, Shares |  |  |  |  | 160,000 ptsi_StockRepurchaseProgramAdditionalSharesAuthorizedToBeRepurchasedPercentOfOutstandingSharesShares / us-gaap_ShareRepurchaseProgramAxis = ptsi_The2014TenderOfferMember |  |  |  |
Treasury Stock Acquired Cost Per Share (in Dollars per share) |  |  | $ 50.00 ptsi_TreasuryStockAcquiredCostPerShare / us-gaap_ShareRepurchaseProgramAxis = ptsi_The2014TenderOfferMember |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  | 571,865 us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = ptsi_The2014TenderOfferMember |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method (in Dollars) |  |  | 28,700,000 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = ptsi_The2014TenderOfferMember |  |  |  |  |  |
The 2013 Tender Offer [Member] |  |  |  |  |  |  |  |  |
Note 7 - Capital Stock (Details) [Line Items] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  | 600,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = ptsi_The2013TenderOfferMember |  |  |
Stock Repurchase Program, Additional Shares Authroized to Be Repurchased, Percent of Outstanding Shares, Percent |  |  |  |  |  | 2.00%ptsi_StockRepurchaseProgramAdditionalSharesAuthroizedToBeRepurchasedPercentOfOutstandingSharesPercent / us-gaap_ShareRepurchaseProgramAxis = ptsi_The2013TenderOfferMember |  |  |
Stock Repurchase Program, Additional Shares Authorized to Be Repurchased, Percent of Outstanding Shares, Shares |  |  |  |  |  | 173,000 ptsi_StockRepurchaseProgramAdditionalSharesAuthorizedToBeRepurchasedPercentOfOutstandingSharesShares / us-gaap_ShareRepurchaseProgramAxis = ptsi_The2013TenderOfferMember |  |  |
Treasury Stock Acquired Cost Per Share (in Dollars per share) |  |  |  | $ 20.50 ptsi_TreasuryStockAcquiredCostPerShare / us-gaap_ShareRepurchaseProgramAxis = ptsi_The2013TenderOfferMember |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  | 675,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = ptsi_The2013TenderOfferMember |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method (in Dollars) |  |  |  | $ 13,900,000 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = ptsi_The2013TenderOfferMember |  |  |  |  |
September 2011 Reauthorization [Member] |  |  |  |  |  |  |  |  |
Note 7 - Capital Stock (Details) [Line Items] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  |  |  |  | 500,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = ptsi_September2011ReauthorizationMember
Treasury Stock, Shares, Acquired |  |  |  |  |  |  | 33,341 us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = ptsi_September2011ReauthorizationMember |  |
September 2011 Authorization [Member] |  |  |  |  |  |  |  |  |
Note 7 - Capital Stock (Details) [Line Items] |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 37,850 us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = ptsi_September2011AuthorizationMember | 50,325 us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = ptsi_September2011AuthorizationMember |  |  |  |  |  | 224,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = ptsi_September2011AuthorizationMember |

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