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Note P - Subsequent Events (Details Textual) - Subsequent Event [Member]	Jul. 13, 2021	Jul. 27, 2021 $ / shares shares
Stockholders' Equity Note, Stock Split, Conversion Ratio	2
Stock Sale Agreement, Maximum Issuable Shares (in shares) | shares		200,000
Stock Sale Agreement, Percent of Outstanding Common Stock		1.70%
Minimum [Member]
Stock Sale Agreement, Share Price (in dollars per share)		$ 32.00
Maximum [Member]
Stock Sale Agreement, Share Price (in dollars per share)		$ 37.00

X

- Definition

The maximum number of issuable shares under a stock sale agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	ptsi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The percent of outstanding common stock being offered under a stock sale agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	ptsi_
Data Type:	dtr-types:percentItemType
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X

- Definition

The share price under a stock sale agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	ptsi_
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Balance Type:	na
Period Type:	instant

X

- Definition

Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187143-122770

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- Details

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- Details

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