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Note 8 - Related-party Transactions (Details Textual) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Oct. 10, 2024 | Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2024
Ironhound Management [Member] |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  | $ 500 |  |
Consulting Services, Initial Fee | $ 125 |  |  |  |  |
Overhead Charged Related to Office Expenses [Member] |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  | $ 60 | $ 120 | $ 120 | $ 178 |
Reimbursable Payroll Expense [Member] |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  | $ 74 | $ 89 |  | $ 44 | $ 135

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- Definition Represents the initial fee on consulting services. + References No definition available. + Details
Name: | clpr_ConsultingServicesInitialFee
Namespace Prefix: | clpr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-1 + Details
Name: | us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=clpr_IronhoundManagementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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