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Note C - Marketable Equity Securities (Details) - Realized Gains on Available for Sale Securities (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Realized gains |  |  |
Sale proceeds | $ 1,407 | $ 13 | $ 3,558
Cost of securities sold | 450 | 6 | 1,561
Gain (Loss) on Investments, Before Tax [Member] |  |  |
Realized gains |  |  |
Realized gains | 957 | 7 | 1,997
Gain (Loss) on Investments, Net of Tax [Member] |  |  |
Realized gains |  |  |
Realized gains | $ 569 | $ 4 | $ 1,194

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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | ptsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | ptsi_RealizedGainsAbstract
Namespace Prefix: | ptsi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition The total amount of proceeds received for the sale of securities, categorized neither as held-to-maturity nor trading securities, during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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