XML 51 R42.htm IDEA: XBRL DOCUMENT
v3.24.1

Subsequent Events (Details) |  |  |  |  |  |  | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 21, 2024 USD ($) D shares | Jan. 19, 2024 USD ($) | Oct. 26, 2023 USD ($) | Jul. 07, 2023 USD ($) | May 25, 2023 shares | May 27, 2021 USD ($) | Dec. 14, 2024 shares | Dec. 31, 2023 USD ($) $ / shares shares | Feb. 29, 2024 shares | Jan. 31, 2024 shares | Dec. 31, 2022 $ / shares shares | Nov. 25, 2021 shares
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |
Estimated federal income taxes | $ |  | $ 1,450,000 | $ 362,282 |  |  |  |  |  |  |  |  |
Aggregate redemption amount | $ |  |  |  | $ 197,694,657 |  |  |  |  |  |  |  |
Sponsor |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding |  |  |  |  | 4,200,000 |  |  |  |  |  |  |
Class A common stock |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |
Aggregate redemption amount | $ |  |  |  |  |  |  |  | $ 197,694,657 |  |  |  |
Common stock, par value (In dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.0001 |  |  | $ 0.0001 |
Common stock, shares issued |  |  |  |  | 27,200,000 |  |  | 8,350,065 |  |  | 23,000,000 |
Common stock, shares outstanding |  |  |  |  |  |  |  | 8,350,065 |  |  | 23,000,000 |
Class A common stock | Sponsor |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  |  | 8,350,065 |  |  |  |
Common stock, shares outstanding |  |  |  |  |  |  |  | 8,350,065 |  |  |  |
Class B common stock |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (In dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.0001 |  |  | $ 0.0001 |
Common stock, shares issued |  |  |  |  |  |  |  | 1,550,000 |  |  | 5,750,000 |
Common stock, shares outstanding |  |  |  |  | 1,550,000 |  |  | 1,550,000 |  |  | 5,750,000 | 5,750,000
Issuance of common stock | $ |  |  |  |  |  | $ 25,000 |  |  |  |  |  |
Class B common stock | Sponsor |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |
Additional non redemption shares transferred |  |  |  |  | 166,666 |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  | 1,550,000 |  |  |  |  |  |  |
Conversion of Class B common stock |  |  |  |  | 4,200,000 |  |  |  |  |  |  |
Common Class Not Subject To Redemption Member |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |
Aggregate redemption amount | $ |  |  |  |  |  |  |  | $ 197,694,657 |  |  |  |
Subsequent Events | Class A common stock |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants in a unit | 0.5 |  |  |  |  |  |  |  |  |  |  |
Number of consecutive trading days | D | 30 |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock | $ | $ 40,000,000 |  |  |  |  |  |  |  |  |  |  |
Subsequent Events | Class A common stock | Sponsor |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding |  |  |  |  |  |  | 0 |  |  |  |  |
Conversion of Class B common stock |  |  |  |  |  |  | 32,214,591 |  |  |  |  |
Subsequent Events | Class B common stock | Sponsor |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |
Additional non redemption shares transferred |  |  |  |  |  |  |  |  | 166,666 | 166,666 |  |
Common stock, shares issued |  |  |  |  |  |  | 0 |  |  |  |  |

X
- Definition The additional non-redemption shares transferred. + References No definition available. + Details
Name: | port_AdditionalNonRedemptionSharesTransferred
Namespace Prefix: | port_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of estimated federal income taxes. + References No definition available. + Details
Name: | port_EstimatedFederalIncomeTaxes
Namespace Prefix: | port_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents number of warrants issued per unit. + References No definition available. + Details
Name: | port_NumberOfWarrantsIssuedPerUnit
Namespace Prefix: | port_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Value of stock classified as temporary equity, bought back by the entity at the exercise price or redemption price. + References No definition available. + Details
Name: | port_TemporaryEquityStockRedeemedOrCalledDuringPeriodValue
Namespace Prefix: | port_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of consecutive threshold trading days where the acquisition company to list shares. + References No definition available. + Details
Name: | port_ThresholdNumberOfConsecutiveTradingDaysToListShares
Namespace Prefix: | port_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_CommonStockSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.6-05(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(4)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(16)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(7)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_CommonStockSharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of shares issued during the period as a result of the conversion of convertible securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1E -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1E Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-3 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-30) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 55 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480167/946-830-55-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480767/946-205-45-4 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481004/946-505-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(4)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_StockIssuedDuringPeriodValueNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481674/830-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 855 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483399/855-10-50-2 + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=port_SponsorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=port_CommonClassNotSubjectToRedemptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |