XML 337 R113.htm IDEA: XBRL DOCUMENT
v3.25.2

Description of Organization and Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($) | Mar. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Deferred tax assets |  | $ 449 | $ 55,525
Angel Studios Inc. Cik0001671941 |  |  |
Deferred tax assets | $ 0 | $ 0 | $ 4,000,319

X
- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
Name: | us-gaap_DeferredTaxAssetsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=port_AngelStudiosInc.Cik0001671941Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |