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Note 8 - Comprehensive Income (Loss) (Details) - Comprehensive Income (Loss) (Parentheticals) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended | 0 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 31, 2013 | Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, tax | $ 1,308 us-gaap_IncomeTaxExpenseBenefit | $ 3,355 us-gaap_IncomeTaxExpenseBenefit | $ 3,160 us-gaap_IncomeTaxExpenseBenefit | $ 898 us-gaap_IncomeTaxExpenseBenefit | $ 776 us-gaap_IncomeTaxExpenseBenefit | $ 1,575 us-gaap_IncomeTaxExpenseBenefit | $ 1,733 us-gaap_IncomeTaxExpenseBenefit | $ (328)us-gaap_IncomeTaxExpenseBenefit | $ 8,721 us-gaap_IncomeTaxExpenseBenefit | $ 3,756 us-gaap_IncomeTaxExpenseBenefit | $ 1,416 us-gaap_IncomeTaxExpenseBenefit |  |
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Before Reclassification [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, tax |  |  |  |  |  |  |  |  | 533 us-gaap_IncomeTaxExpenseBenefit / us-gaap_OtherComprehensiveIncomeLocationAxis = ptsi_BeforeReclassificationMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  | 1,298 us-gaap_IncomeTaxExpenseBenefit / us-gaap_OtherComprehensiveIncomeLocationAxis = ptsi_BeforeReclassificationMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Amounts Reclassified from AOCI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, tax |  |  |  |  |  |  |  |  | (385)us-gaap_IncomeTaxExpenseBenefit / us-gaap_OtherComprehensiveIncomeLocationAxis = ptsi_AmountsReclassifiedFromAOCIMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  | (120)us-gaap_IncomeTaxExpenseBenefit / us-gaap_OtherComprehensiveIncomeLocationAxis = ptsi_AmountsReclassifiedFromAOCIMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, tax |  |  |  |  |  |  |  |  | $ 3,918 us-gaap_IncomeTaxExpenseBenefit / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  | $ 2,592 us-gaap_IncomeTaxExpenseBenefit / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | $ 3,770 us-gaap_IncomeTaxExpenseBenefit / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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