Note 13 - Stock-based Compensation - Share based Compensation (Details) - Restricted Stock [Member]	Dec. 31, 2020 USD ($)
2021	$ 342,000
2022	375,000
2023	310,000
2024	297,000
2025	354,000
2026	288,000
2027	$ 111,000

Amount of cost to be recognized for nonvested award in year five under share-based payment arrangement.

No definition available.

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Amount of cost to be recognized for nonvested award in year four under share-based payment arrangement.

No definition available.

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Amount of cost to be recognized for nonvested award in year one under share-based payment arrangement.

No definition available.

Name:	ptsi_SharebasedPaymentArrangementNonvestedAwardCostToBeRecognizedYearOne
Namespace Prefix:	ptsi_
Data Type:	xbrli:monetaryItemType
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Amount of cost to be recognized for nonvested award in year seven under share-based payment arrangement.

No definition available.

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Namespace Prefix:	ptsi_
Data Type:	xbrli:monetaryItemType
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Amount of cost to be recognized for nonvested award in year six under share-based payment arrangement.

No definition available.

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Namespace Prefix:	ptsi_
Data Type:	xbrli:monetaryItemType
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Amount of cost to be recognized for nonvested award in year three under share-based payment arrangement.

No definition available.

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Namespace Prefix:	ptsi_
Data Type:	xbrli:monetaryItemType
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Amount of cost to be yet recognized for nonvested award in year two under share-based payment arrangement.

No definition available.

Name:	ptsi_SharebasedPaymentArrangementNonvestedAwardCostToBeRecognizedYearTwo
Namespace Prefix:	ptsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: