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Note 9 - Related-party Transactions (Details Textual) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Overhead Charged Related to Office Expenses [Member] | General and Administrative Expense [Member] |  |
Related Party Transaction, Amounts of Transaction | $ 64 | $ 66
Reimbursable Payroll Expense [Member] | General and Administrative Expense [Member] |  |
Related Party Transaction, Amounts of Transaction | 8 | 41
Firms in Which Two Directors Were Principals or Partners [Member] |  |
Related Party Transaction, Amounts of Transaction | $ 0 | $ 404

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 + 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_RelatedPartyTransactionAxis=clpr_OverheadChargedRelatedToOfficeExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
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: |

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