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Note 4 - Marketable Equity Securities - Realized Gains on Marketable Equity Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Sale proceeds | $ 2,039 | $ 2,984 | $ 1,044
Cost of securities sold | 2,216 | 1,929 | 669
Realized (losses) / gains | (177) | 1,055 | 375
Realized (losses) / gains, net of taxes | $ (90) | $ 815 | $ 278

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- Definition The cost of securities that sold during the period. + References No definition available. + Details
Name: | ptsi_EquitySecuritiesCostOfSecuritiesSold
Namespace Prefix: | ptsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of realized gain (loss) from sale of investment in equity security, net of related taxes. + References No definition available. + Details
Name: | ptsi_EquitySecuritiesFvniRealizedGainLossNetOfTax
Namespace Prefix: | ptsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The total amount of proceeds received for the sale of equity securities. + References No definition available. + Details
Name: | ptsi_EquitySecuritiesSaleProceeds
Namespace Prefix: | ptsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117546-209714 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
Name: | us-gaap_EquitySecuritiesFvNiRealizedGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration