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Note 16 - Commitments and Contingencies (Details Textual) - USD ($)		12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 01, 2020	Jul. 31, 2020	Sep. 01, 2019
Self Insurance Auto Liability Claims Threshold Amount					$ 2,000,000.0		$ 1,000,000.0
Trucks under Operating Lease [Member]
Operating Lease, Expense		$ 0	$ 0	$ 47,000
The Violations under the Fair Labor Standards Act and the Arkansas Minimum Wage [Member]
Loss Contingency Accrual, Ending Balance						$ 16,500,000
Litigation Settlement, Amount Awarded to Other Party	$ 421,000

X

- Definition

Represents self insurance auto liability claims threshold amount.

+ References

No definition available.

+ Details

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Namespace Prefix:	ptsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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

X

- Details

Name:	srt_LitigationCaseAxis=ptsi_TheViolationsUnderTheFairLaborStandardsActAndTheArkansasMinimumWageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: