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Note N - Subsequent Events (Details Textual) - Subsequent Event [Member] - The 2017 Tender Offer [Member]	1 Months Ended
	Oct. 31, 2017 $ / shares shares
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | shares	400,000
Stock Repurchase Program Additional Shares Authroized To Be Repurchased Percent Of Outstanding Shares Percent	2.00%
Stock Repurchase Program Additional Shares Authorized To Be Repurchased Percent Of Outstanding Shares, Shares | shares	126,060
Minimum [Member]
Stock Repurchase Program, Future Price Per Share | $ / shares	$ 27
Maximum [Member]
Stock Repurchase Program, Future Price Per Share | $ / shares	$ 30

X

- Definition

The amount additional shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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

X

- Definition

The percent of outstanding stock, authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	ptsi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the price level per share to be paid in the future under a current stock repurchase program.

+ References

No definition available.

+ Details

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Namespace Prefix:	ptsi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Details

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X

- Details

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Period Type:

X

- Details

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X

- Details

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