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Note 6 - Long-term Debt (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($)
Line of Credit Facility, Interest Rate at Period End | 2.86%
Letters of Credit Outstanding, Amount | $ 706,000
Line of Credit [Member] |
Debt Instrument, Face Amount | $ 40,000,000
Ratio of Indebtedness to Net Capital | 4
Line of Credit Facility, Outstanding Advances | $ 700,000
Letters of Credit Outstanding, Amount | 700,000
Line of Credit Facility, Remaining Borrowing Capacity | $ 39,300,000
Line of Credit [Member] | Equipment Financing [Member] |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 2.52%
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] |
Debt Instrument, Basis Spread on Variable Rate | 1.50%

X
- Definition Amount of outstanding advances under the credit facility. + References No definition available. + Details
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Namespace Prefix: | ptsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | na
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Weighted average interest rate of long-term debt outstanding calculated at point in time. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

X
- Definition Indebtedness divided by net capital. + References No definition available. + Details
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Balance Type: | na
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- Details
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Period Type: |

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- Details
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Period Type: |

X
- Details
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Period Type: |