Insider Trading Policies and Procedures [Line Items] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Cybersecurity Risk Management, Strategy, and Governance [Abstract] Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block] Cybersecurity Risk Management Processes Integrated [Flag] Cybersecurity Risk Management Processes Integrated [Text Block] Cybersecurity Risk Management Third Party Engaged [Flag] Cybersecurity Risk Third Party Oversight and Identification Processes [Flag] Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag] Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Text Block] Cybersecurity Risk Board of Directors Oversight [Text Block] Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block] Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block] Cybersecurity Risk Role of Management [Text Block] Cybersecurity Risk Management Positions or Committees Responsible [Flag] Cybersecurity Risk Management Positions or Committees Responsible [Text Block] Cybersecurity Risk Management Expertise of Management Responsible [Text Block] Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block] Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag] Customer [Domain] Geographical [Domain] Geographical [Axis] Customer [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Maximum [Member] Minimum [Member] Counterparty Name [Axis] Counterparty Name [Domain] Product and Service [Domain] Product and Service [Axis] LIBERIA MARSHALL ISLANDS Total Construction Contractor, Receivable, Excluding Contract Retainage Accounts Receivable, after Allowance for Credit Loss Accounts Receivable, after Allowance for Credit Loss Accounts receivable, net (Note 3) Accounts receivable, non-current Accounts Receivable, after Allowance for Credit Loss, Noncurrent Accumulated depreciation Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Additional paid-in capital Amortization of Debt Issuance Costs and Discounts Amortization of Debt Issuance Costs and Discounts Depreciation (Note 5) Depreciation Gain (Loss) on Sale of Derivatives Gain (Loss) on Sale of Derivatives Gain on derivative instruments, net Unrealized Gain (Loss) on Derivatives Amortization Amortization of Deferred Charges Amortization of Deferred Charges Amortization and write-off of financing costs Amortization and write-off Statement of Financial Position [Abstract] Earnings / (Losses) per common share, basic and diluted (in dollars per share) Earnings / (Losses) per common share, basic and diluted (Note 12) (in dollars per share) Capital Addition Purchase Commitments [Member] Cash acquired from acquisition of subsidiaries (Note 1) Cash and cash equivalents (Note 2) Cash and cash equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Cash paid during the period for interest Accounts receivable and margin deposits Increase (Decrease) in Accounts Receivable Inventories Increase (Decrease) in Inventories Prepayments and other Increase (Decrease) in Prepaid Expense and Other Assets Changes in operating assets and liabilities: Accounts payable Increase (Decrease) in Accounts Payable Accrued liabilities Increase (Decrease) in Accrued Liabilities Due to related parties Increase (Decrease) in Due to Related Parties Due from related parties Increase (Decrease) in Due from Related Parties Commitments and Contingencies Disclosure [Text Block] Common stock, shares authorized (in shares) Common stock, shares issued (in shares) Common Stock, Shares, Issued (in shares) Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding (in shares) Common stock (par value $0.0001, 1,000,000,000 common shares authorized as of December 31, 2024 and 2025. 10,000 and 24,362,000 shares issued; and 10,000 and 24,180,472 shares outstanding as of December 31, 2024 and 2025, respectively) (Note 11) Total comprehensive loss for the period Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive Income (Loss) Note [Text Block] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block] Proceeds from Contributions from Affiliates Cash contribution in relation to the Spin-Off (Note 1) Proceeds from Contributions from Affiliates Total current liabilities Liabilities, Current CURRENT LIABILITIES: Customer Concentration Risk [Member] Long-Term Debt, Gross Total Long-Term Debt, Gross Debt Instrument, Face Amount Debt Instrument, Face Amount Debt Instrument, Interest Rate During Period Debt Instrument, Interest Rate During Period Debt Instrument, Name [Domain] Debt Instrument, Periodic Payment Debt Instrument, Periodic Payment Debt Instrument [Axis] Schedule of Long-Term Debt Instruments [Table] Deferred charges, net (Note 6) Unearned revenue (Note 9) Deferred Revenue, Current Derivative, Notional Amount Derivative, Notional Amount Derivative, Number of Instruments Held Derivative, Number of Instruments Held Fair value of derivatives (Notes 16 and 18) Derivative Asset, Current Derivative asset (liability) Derivative Assets (Liabilities), at Fair Value, Net Fair value of derivatives, non-current (Notes 13 and 14) Derivative Asset, Noncurrent Derivative Instruments and Hedging Activities Disclosure [Text Block] Fair value of derivatives (Notes 16 and 18) Fair value of derivatives (Notes 13 and 14) Fair value of derivatives, non-current portion (Notes 13 and 14) Derivative [Table] Derivatives, Policy [Policy Text Block] Consolidation, Policy [Policy Text Block] Discontinued Operations, Policy [Policy Text Block] Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Share-Based Payment Arrangement, Expense Share-Based Payment Arrangement, Expense Equity based payments from Parent Share-Based Payment Arrangement, Noncash Expense Fair Value of Financial Instruments, Policy [Policy Text Block] Payment of financing costs Payments of Financing Costs Foreign Currency Fair Value Hedge Asset at Fair Value Foreign Currency Fair Value Hedge Asset at Fair Value Foreign Currency Transactions and Translations Policy [Policy Text Block] Gain / (loss) on derivative instruments, net (Note 13) Gain on derivative instruments, net Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments General and administrative expenses General and Administrative Expense Vessels' impairment loss Vessels' impairment loss (Notes 5 and 14) Impairment, Long-Lived Asset, Held-for-Use Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Income Statement [Abstract] Income Tax Disclosure [Text Block] Insurance claims receivable Increase (Decrease) in Insurance Settlements Receivable Interest expense Interest Expense, Operating and Nonoperating Interest Expense, Debt Interest Expense, Debt Interest Rate Cap [Member] Interest Receivable Interest Receivable Inventories (Note 4) Inventory, Policy [Policy Text Block] Total liabilities and stockholders' equity Liabilities and Equity Loans Payable [Member] Current portion of long-term debt, net of deferred financing costs (Note 7) 2031 and thereafter Long-Term Debt, Maturity, after Year Five 2026 Long-Term Debt, Maturity, Year One 2030 Long-Term Debt, Maturity, Year Five 2029 Long-Term Debt, Maturity, Year Four 2028 Long-Term Debt, Maturity, Year Three 2027 Long-Term Debt, Maturity, Year Two Long-term debt, net of current portion and deferred financing costs (Note 7) Total long-term debt, non-current, net Total long-term debt, net Long-Term Debt Margin deposits (Note 16) Margin Deposit Assets Related and Nonrelated Parties [Axis] Net Cash provided by/ (used in) Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Cash Flows From Financing Activities: Net Cash provided by / (used in) Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Cash Flows From Investing Activities: Net Cash provided by / (used in) Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Cash Flows From Operating Activities: Net loss: -Net loss Net loss Accounting Standards Update and Change in Accounting Principle [Table] Total other expenses, net Nonoperating Income (Expense) OTHER INCOME / (EXPENSES): Interest and Debt Expense Total Interest and finance costs, net (Note 11) Interest and Debt Expense NON-CURRENT ASSETS: Total non-current liabilities Liabilities, Noncurrent NON-CURRENT LIABILITIES: Nonmonetary Transaction Type [Axis] Nonmonetary Transaction, by Type [Table] Nonmonetary Transaction Type [Domain] Operating loss Operating Income (Loss) Total voyage revenue Revenues REVENUES: Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net Other, net Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Preferred stock, shares authorized (in shares) Preferred stock, shares issued (in shares) Preferred stock, shares outstanding (in shares) Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share (in dollars per share) Net parent investment Cash advance from parent company Proceeds from the settlement of insurance claims Share capital increase Proceeds from Issuance of Common Stock Proceeds from Issuance of Preferred Stock and Preference Stock Proceeds from Issuance of Preferred Stock and Preference Stock Proceeds from Issuance of Long-Term Debt Proceeds from Issuance of Long-Term Debt Proceeds from long-term debt Proceeds from related party loans Total fixed assets, net Property, Plant and Equipment, Net FIXED ASSETS, NET: Property, Plant and Equipment, Policy [Policy Text Block] Receivable [Policy Text Block] Related and Nonrelated Parties [Domain] Related Party Transactions Disclosure [Text Block] Related Party Transaction [Table] Repayments of Long-Term Debt Repayments of Long-Term Debt Repayment of long-term debt Repayment of Long-Term Debt, Long-Term Lease Obligation, and Capital Security Restricted cash - current portion Restricted Cash and Cash Equivalent, Current Retained earnings / (Accumulated deficit) Revenue [Policy Text Block] Schedule of Derivative Instruments [Table Text Block] Inventory Disclosure [Text Block] Series B Preferred Stock [Member] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Significant Accounting Policies [Text Block] Statement of Cash Flows [Abstract] Statement of Comprehensive Income [Abstract] Statement of Stockholders' Equity [Abstract] Share-Based Payment Arrangement [Policy Text Block] Stockholders' Equity Note, Redeemable Preferred Stock, Issue, Policy [Policy Text Block] STOCKHOLDERS' EQUITY: Equity [Text Block] Subsequent Event Type [Axis] Subsequent Event [Table] Subsequent Event Type [Domain] Supplemental Cash Information: Total current assets Assets, Current CURRENT ASSETS: Unsecured Debt [Member] Weighted Average Number of Shares Outstanding, Diluted, Adjustment (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Weighted average number of common shares, basic and diluted (in shares) Weighted average number of shares, basic and diluted (in shares) Restricted cash, non-current (Note 2) Restricted cash - non-current portion Common Stock [Member] Long-Lived Tangible Asset [Domain] Vessels' acquisitions and other vessels' costs Vessel sales, transfers and other movements, net Property, Plant and Equipment, Disposals Preferred Stock [Member] Total assets Assets Receivable [Domain] Accounts Receivable, Allowance for Credit Loss Accounts Receivable, Allowance for Credit Loss Interest income Investment Income, Interest Financing costs, non-current portion Debt Issuance Costs, Noncurrent, Net Less: Current portion of financing costs Add: Deferred financing costs, current portion Debt Issuance Costs, Current, Net Other current liabilities Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Preferred Stock, Redemption Price Per Share (in dollars per share) Preferred Stock, Redemption Price Per Share Statement [Table] Statement [Line Items] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] Property, Plant, and Equipment, Fair Value Disclosure Property, Plant, and Equipment, Fair Value Disclosure Class of Stock [Domain] Category of Item Purchased [Axis] Long-Term Purchase Commitment, Category of Item Purchased [Domain] Long-Term Purchase Commitment, Amount Long-Term Purchase Commitment, Amount Balance, December 31, Balance, January 1, 2024 Debt Issuance Costs, Net Unearned revenue Increase (Decrease) in Deferred Revenue EXPENSES: Antidilutive Security, Excluded EPS Calculation [Table] Earnings Per Share, Policy [Policy Text Block] Other liabilities Increase (Decrease) in Other Operating Liabilities Class of Stock [Axis] Property, Plant and Equipment [Table] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share (in dollars per share) Long-Lived Tangible Asset [Axis] Debt, Policy [Policy Text Block] Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral Vessels' operating expenses Operating Costs and Expenses Total stockholders' equity Balance Balance Equity, Attributable to Parent Preferred stock (par value $0.0001, 100,000,000 preferred shares authorized, as of December 31, 2024 and 2025. Nil and 235 Series B Preferred shares issued and outstanding as of December 31, 2024 and 2025, respectively.) (Note 11) -Capitalization at Spin-Off including issuance of common stock (Notes 1 and 11) Equity Components [Axis] Additional Paid-in Capital [Member] Retained Earnings [Member] AOCI Attributable to Parent [Member] Equity Component [Domain] Long-Term Debt [Text Block] Share capital increase Issuance of common stock (Notes 1 and 11) (in shares) Stock Issued During Period, Shares, New Issues (in shares) Less: Deferred financing costs Debt Issuance Costs, Gross Earnings Per Share [Text Block] Depreciation Depreciation, Depletion and Amortization Depreciation, Depletion and Amortization Receivable Type [Axis] Insurance claims receivable Stock, Class of Stock [Table] Consolidation, Less-than-Wholly-Owned Subsidiary, Parent Ownership Interest, Effect of Change [Table] COMMITMENTS AND CONTINGENCIES Adjustments to reconcile net loss to net cash provided by/(used in) operating activities: Long-Term Debt, Type [Axis] Accounts Payable Accounts Payable Interest Payable Interest Payable Accounts payable Accounts Payable, Current Accrued liabilities Other comprehensive loss: Other comprehensive income/ (loss) -Other comprehensive loss Other comprehensive loss for the period Long-Term Debt, Type [Domain] Prepayments and other assets Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Measurement Frequency [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value, Recurring [Member] Fair Value, Nonrecurring [Member] Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Payment for Debt Extinguishment or Debt Prepayment Cost Payment for Debt Extinguishment or Debt Prepayment Cost 2026 Construction Contractor, Receivable, Excluding Contract Retainage, Year One 2027 Construction Contractor, Receivable, Excluding Contract Retainage, Year Two Balance (in shares) Balance (in shares) Shares, Outstanding Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] Proceeds from Issuance of Debt Proceeds from Issuance of Debt Fair Value Hierarchy and NAV [Axis] Measurement Frequency [Axis] Schedule of Maturities of Long-Term Debt [Table Text Block] Notes Tables Table Text Block [Abstract] Subsequent Events [Text Block] Financial Instruments Disclosure [Text Block] Use of Estimates, Policy [Policy Text Block] Segment Reporting, Policy [Policy Text Block] Balance, December 31 Balance, January 1, 2024 Deferred Costs Schedule of Debt [Table Text Block] Long-Term Debt, Weighted Average Interest Rate, at Point in Time Long-Term Debt, Weighted Average Interest Rate, at Point in Time Accounting Policies [Abstract] Derivative Instrument [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Non-Cash Investing and Financing Activities: Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Comprehensive Income, Policy [Policy Text Block] Subsequent Event [Member] New Accounting Pronouncements, Policy [Policy Text Block] Concentration Risk, Credit Risk, Policy [Policy Text Block] Stock Issued During Period, Shares, Issued for Services (in shares) Stock Issued During Period, Shares, Issued for Services Property, Plant and Equipment, Useful Life (Year) Property, Plant and Equipment, Useful Life Number of Reportable Segments Number of Reportable Segments Derivative, Average Forward Exchange Rate Derivative, Average Forward Exchange Rate Concentration risk percentage Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Net of Tax Derivative Contract [Domain] Investment Owned, Balance, Shares (in shares) Spinoff [Member] Offsetting Assets [Table] Revenue Benchmark [Member] Other Commitments [Table] Accumulated Other Comprehensive Income (Loss) [Table] Other Nonoperating Income and Expense [Text Block] Inventory, Current [Table] Related Party Transaction [Axis] Related Party Transaction [Domain] Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid Treasury Stock, Common [Member] Balance (in shares) Balance (in shares) Treasury Stock, Common, Shares Sublease Income Sublease Income Disaggregation of Revenue [Table] Capitalized Contract Cost, Gross Capitalized Contract Cost, Gross Operating leases, right-of-use assets (Note 8) Operating Lease, Right-of-Use Asset Lessee, Lease, Description [Table] Restricted cash (Note 2(e)) Net increase/ (decrease) in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Total cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Cash, cash equivalents and restricted cash at end of the period Cash, cash equivalents and restricted cash at beginning of the period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Right-of-use assets obtained in exchange for operating lease obligations Operating Lease, Weighted Average Discount Rate, Percent Operating Lease, Weighted Average Discount Rate, Percent Total Lessee, Operating Lease, Liability, to be Paid 2026 Lessee, Operating Lease, Liability, to be Paid, Year One Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Operating lease liabilities, including current portion Operating Lease, Liability Operating Lease, Liability Operating lease liabilities, current portion (Note 8) Discount based on incremental borrowing rate Lessee, Operating Lease, Liability, Undiscounted Excess Amount Operating lease liabilities, non-current portion Lessee, Leases [Policy Text Block] Lessee, Operating Leases [Text Block] Operating Lease, Weighted Average Remaining Lease Term (Year) Operating Lease, Weighted Average Remaining Lease Term Asset Management Arrangement [Member] Unrealized loss on cash flow hedges, net (Notes 13 and 15) Interest rate caps (included component) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Reclassification to Interest and finance costs Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Interest rate caps (excluded component) (1) Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax Reclassification of amount excluded from the interest rate caps assessment of effectiveness based on an amortization approach to Interest and finance costs (Notes 11, 13 and 15) Reclassification of amount excluded from the interest rate caps assessment of hedge effectiveness based on an amortization approach to Interest and finance costs Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, after Tax Sale Leaseback Transaction, Lease Term (Year) Sale Leaseback Transaction, Lease Term Related Party [Member] Nonrelated Party [Member] Supplier Finance Program [Table] Effective Income Tax Rate Reconciliation [Table] Interest expense - related parties (Note 3) Interest Expense, Nonoperating Cover [Abstract] Document Type Document Annual Report Document Transition Report Document Shell Company Report Document Financial Statement Error Correction [Flag] Entity Interactive Data Current Document Registration Statement Document Accounting Standard Amendment Flag ICFR Auditor Attestation Flag Document Fiscal Year Focus Document Fiscal Period Focus Document Period End Date Legal Entity [Axis] Entity [Domain] Entity Registrant Name Entity Central Index Key Entity File Number Entity Incorporation, State or Country Code Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Shell Company Entity Filer Category Entity Emerging Growth Company Entity Ex Transition Period Entity Addresses [Table] Entity Addresses, Address Type [Axis] Address Type [Domain] Business Contact [Member] Entity Addresses [Line Items] Contact Personnel Name Entity Address, Address Line One Entity Address, City or Town Entity Address, Country Entity Address, Postal Zip Code Country Region City Area Code Local Phone Number Title of 12(b) Security No Trading Symbol Flag Trading Symbol Security Exchange Name Entity Common Stock, Shares Outstanding Auditor Name Auditor Firm ID Auditor Location Represents preferred stock purchase rights. Preferred Stock Purchase Rights [Member] Represents Costamare Bulkers Holdings Limited Predecessor. Costamare Bulkers Holdings Limited Predecessor [Member] The increase (decrease) during the reporting period, in revenue earned but not yet received, which were recognized in under the straight-line method in conformity with revenue recognition criteria based on specific contractual terms. cmdb_IncreaseDecreaseOnAccruedCharterRevenue Accrued charter revenue Amount of amortization of hedge effectiveness excluded component from cash flow hedges. Amortization of hedge effectiveness excluded component from cash flow hedges Amortization of excluded component related to cash flow hedges Amount of gain (loss) on vessels held for sale. Loss on vessels held for sale (Note 5) Loss on vessels held for sale Gain (Loss) on Vessels Held for Sale Amount of amortization expense of time charter assumed. Amortization of assumed time charter Amortization of assumed time charter The difference between the sale price or salvage price and the book value of a vessel that was sold during the reporting period. This element refers to the gain (loss). Gain / (loss) on sale of vessels, net (Note 5) (Gain)/ loss on sale of vessels, net Gain (Loss) on Sales of Vessels, Net The cash inflow from the sale of vessels. Proceeds from the sale of vessels, net The cash outflow associated with the acquisition of vessel that are used in the normal conduct of business to produce goods and services and not intended for resale and or upgrades of existing vessels to increase their earnings capacity. cmdb_PaymentsToAcquireVessels Vessel acquisition and advances/Additions to vessel cost Amount of increase (decrease) in dry-dockings. cmdb_IncreaseDecreaseInDrydockings Dry-dockings Amortization of deferred dry-docking and special survey costs. Amortization of deferred dry-docking and special survey costs Amortization of dry-docking and special survey costs (Note 6) Notes To Financial Statements [Abstract] Tabular disclosure of interest and finance costs and amortization of financing costs. Interest and Finance Costs [Text Block] Note 11 - Interest and Finance Costs, Net Tabular disclosure of interest and debt related expenses. Interest and Finance Costs [Table Text Block] Note 2 - Significant Accounting Policies and Recent Accounting Pronouncements - Revenues from Significant Charterers 1 (Details) Information pertaining to all major customers. All Major Customers [Member] Information pertaining to major customer B. Major Customer B [Member] Information pertaining to major customer A. Major Customer A [Member] Note 2 - Significant Accounting Policies and Recent Accounting Pronouncements - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) Note 2 - Significant Accounting Policies and Recent Accounting Pronouncements - Revenues from Significant Charterers (Details) This element includes vessels' book value net of accumulated depreciation and advances for vessel acquisitions and or under construction. Vessels, net (Note 5) Amount of net parent investment. Net Parent Investment (Note 9) Net Parent Investment (Note 9) Note To Financial Statement Details Textual Note 7 - Long-term Debt 1 The number of vessels in a commercial pool employment arrangement. cmdb_VesselsInCommercialPoolEmploymentArrangement Vessels in Commercial Pool Employment Arrangement Refers to information regarding future minimum contractual charter revenues assumptions. Future Minimum Contractual Charter Revenues Assumptions [Member] The number of vessels for which time charter rate is index linked cmdb_VesselsForWhichTimeCharterRateIsIndexLinked Vessels for Which Time Charter Rate is Index Linked The number of assumed revenue days used in the calculation of the contracted revenue. cmdb_RevenueDaysPerAnnum Revenue Days Per Annum (Day) The remaining terms period (in total months) of the contracted time charter agreements, including the contracted time charter agreements of vessels under construction, from the end of the reporting period. cmdb_TimeCharterArrangementsRemainingTermsPeriod Time Charter Arrangements Remaining Terms Period (Month) Note 18 - Financial Instruments - Fair Value of Assets and Liabilities (Details) Represents Euro/U.S. dollar currency options. Euro/U.S. Dollar Currency Options [Member] Represents Forward Freight Agreements ("FFAs"). Forward Freight Agreements ("FFAs") [Member] Represents EUA futures. EUA Futures [Member] Represents bunker swap agreements. Bunker Swap Agreements [Member] Note 14 - Interest and Finance Costs Represents net parent investment. Net Parent Investment [Member] Amount of equity impact of parent distributions, net. -Parent distributions, net (Note 9) Represents Koushun. Koushun [Member] Represents Adstone Marine Corp. et al. loan agreement entered 2024. Adstone Marine Corp. et al. Loan Agreement Entered 2024 [Member] Represents Miracle. Miracle [Member] Represents Clara. Clara [Member] This element represents the carrying capacity of vessels in DWT (dead weight tonnage) as at the end of each reporting period. cmdb_CarryingCapacityOfDryBulkVesselsAtPeriodEndDwt Carrying Capacity of Dry Bulk Vessels at Period End (DWT) Note 12 - Earnings (Losses) Per Share - Schedule of Earnings Per Share (Details) Note 12 - Earnings (Losses) Per Share The percentage of United States related gross transportation income on which tax applied, unless an exemption applies. cmdb_USRelatedGrossTransportationIncomeThatTaxApplies US Related Gross Transportation Income That Tax Applies Note 11 - Interest and Finance Costs, Net - Schedule of Income Statement Related Costs (Details) The amount of bank charges and other financing costs. cmdb_BankChargesAndOtherFinancingCosts Bank charges and other financing costs Interest expense for interest rate swaps qualifying for cash flow hedge during the reporting period. cmdb_SwapInterestExpenseNet Derivatives' effect Note 14 - Interest and Finance Costs - Schedule of Income Statement Related Costs (Details) The total of expenses of managing and administering the affairs of an entity paid to related parties, including affiliates of the reporting entity, which are not directly or indirectly associated with vessel operations. cmdb_GeneralAndAdministrativeExpensesRelatedParties General and administrative expenses - related parties (Note 3) General and Administrative Expenses, Related Parties Amount of expenses relating to charter-in hire. cmdb_CharterinHireExpenses Charter-in hire expenses (Note 8) Charter-in hire expenses Charter-in Hire Expenses Fees paid to related parties for providing the company with technical, crewing, bunkering, accounting, provisions, sale, purchase services, as well as general administrative, certain commercial services, director and officer related insurance services. cmdb_ManagementAndAgencyFeesRelatedParties Management and agency fees - related parties (Note 3) Management and Agency Fees, Related Parties Expenses paid to third parties primarily consisting of port, canal and bunker expenses, commissions that are unique to a particular charter and are paid for by the charterer under time charter arrangements or by the company under voyage charter arrangements, and commissions that are paid directly to brokers by the company. cmdb_VoyageExpenses Voyage expenses Revenues generated from time charter and voyage charter agreements, recognized over the term of the charter, recorded as service is provided, when they become fixed and determinable. Voyage revenue Voyage Revenue The amount of foreign exchange gains (losses) included in operating income (loss) during the period. Foreign exchange gains Note 14 - Financial Instruments Tabular disclosure of derivative assets and liabilities at fair value. Schedule of Derivative Assets and Liabilities at Fair Value [Table Text Block] Note 18 - Financial Instruments Represents Pythias and Bernis. Pythias and Bernis [Member] Represents Acuity, Verity, Equity and Parity. Acuity, Verity, Equity and Parity [Member] The number of vessels with seller's credit. cmdb_NumberOfVesselsWithSellersCredit Number of Vessels With Seller's Credit Represents Parity. Parity [Member] The entire disclosure for unearned revenue. Unearned Revenue [Text Block] Treasury stock is stock that is repurchased by the issuing entity, reducing the number of outstanding shares in the open market. When shares are repurchased, they may either be cancelled or held for reissue. If not cancelled, such shares are referred to as treasury shares. The cost of the acquired shares is shown as a deduction in stockholders' equity. Dividends on such shares held in the entity's treasury should not be reflected as income and are not shown as a reduction in equity. Depending on whether the shares are acquired for reissuance or retirement, treasury shares are accounted for under the cost method or the constructive retirement method. The cost method is also used when the reporting entity's management has not made decisions as to whether the reacquired shares will be retired, held indefinitely or reissued. The Company elected for the repurchase of its common shares to be accounted for under the cost method. Under this method, the treasury stock account is charged for the aggregate cost of shares reacquired. Treasury Stock [Policy Text Block] Disclosure of accounting policy for reporting when there is a substantial doubt about an entity's ability to continue as a going concern for a reasonable period of time (generally a year from the balance sheet date). Going Concern, Policy [Policy Text Block] Disclosure of accounting policy for special survey and drydocking costs Accounting for Special Survey and Dry-docking Costs [Policy Text Block] Disclosure of accounting policy regarding the recognition and recording of the insurance claim receivables. Insurance Claim Receivables [Policy Text Block] Disclosure of vessels net of accumulated depreciation, additions to vessels' cost and advances for vessel acquisitions and or vessels under construction. Vessels and Advances, Net [Text block] Note 5 - Vessels, Net - Summary of Vessels (Details) Amount of decrease in vessels cost for vessel sales, transfers and other movements. cmdb_VesselsCostVesselSalesTransfersAndOtherMovements Vessel sales, transfers and other movements Represents net book value. Net Book Value [Member] Represents vessel cost. Vessel Cost [Member] Represents accumulated depreciation. Accumulated Depreciation [Member] Cost of vessels, including contract price and any material expenses incurred upon acquisition (initial repairs, improvements and delivery expenses, interest and on-site supervision costs incurred during the construction periods), less accumulated depreciation. cmdb_VesselsNet Net book value Net book value Cost of vessels, including contract price and any material expenses incurred upon acquisition (initial repairs, improvements and delivery expenses, interest and on-site supervision costs incurred during the construction periods). cmdb_VesselsAtCost Vessels cost Vessels cost Amount of contribution of vessels as part of the Spin-Off. Contribution of vessels as part of the Spin-Off (Note 1) Amount of decrease to accumulated depreciation for vessel sales, transfers and other movements. cmdb_AccumulatedDepreciationVesselSalesTransfersAndOtherMovements Vessel sales, transfers and other movements, accumulated depreciation Note 2 - Significant Accounting Policies and Recent Accounting Pronouncements - Reconciliation of Cash, Cash Equivalents and Restricted Cash 1 (Details) Note 7 - Long-term Debt - Financing Costs Included in Loan Balances (Details) Amount of increase in debt issuance costs, after accumulated amortization. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. Additions The entire disclosure for deferred charges. Deferred Charges [Text Block] Deferred Charges, net [Text Block] Represents Pythias. Pythias [Member] Represents Imperator (ex. Imperator Australis). Imperator (ex. Imperator Australis) [Member] Repreents Gorgo (ex. Gorgoypikoos). Gorgo (ex. Gorgoypikoos) [Member] Represents Bernis. Bernis [Member] Represents Andati Marine Corp. et al. loan agreement entered 2024. Andati Marine Corp. et al. Loan Agreement Entered 2024 [Member] Represents Archet Marine Corp. et al. loan agreement entered 2024. Archet Marine Corp. et al. Loan Agreement Entered 2024 [Member] Represents Costamare Bulkers Ships Inc. loan agreement entered 2025. Costamare Bulkers Ships Inc. Loan Agreement Entered 2025 [Member] The number of vessels that special survey for dry docking is still in process. cmdb_NumberOfVesselsSurveyInProcess Number of Vessels Survey in Process The number of vessels completed dry-docking (DD) during the reporting period. cmdb_NumberOfVesselsCompletedDdDuringPeriod Number of Vessels Completed DD During Period The number of vessels provided as collaterals to secure loans as of the reporting period. cmdb_NumberOfVesselsProvidedAsCollateralsToSecureLoans Number of Vessels Provided as Collaterals to Secure Loans Term of the receivable. cmdb_ReceivableTerm Receivable, Term (Year) The carrying value of vessels provided as collaterals to secure loans as of the reporting period. cmdb_CarryingValueOfVesselsProvidedAsCollateralsToSecureLoans Carrying Value of Vessels Provided as Collaterals to Secure Loans Represents Rose, Resource, Pythias, Bernis, Gorgo, Acuity, Verity, Equity and Parity. Rose, Resource, Pythias, Bernis, Gorgo, Acuity, Verity, Equity and Parity [Member] Represents Imperator (ex. Imperator Australis) and Gorgo (ex. Gorgoypikoos). Imperator (ex. Imperator Australis) and Gorgo (ex. Gorgoypikoos) [Member] The number of unencumbered vessels. cmdb_NumberOfUnencumberedVessels Number of Unencumbered Vessels Note 6 - Deferred Charges, Net Tabular disclosure relating to deferred charges including additions, amortization and write-offs of financing cost and vessels drydocking costs. And if applicable transfers to assets held for sale. Schedule of Deferred Charges [Table Text Block] Note 6 - Deferred Charges, Net - Schedule of Deferred Charges, Net (Details) Amount of write-off and other movements in deferred charges. cmdb_DeferredChargesWriteoffAndOtherMovements Write-off and other movements Represents the amount of additions to deferred charges. cmdb_DeferredChargesAdditions Additions Note 7 - Long-term Debt - Schedule of Long-term Debt (Details) Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. cmdb_LongtermDebtGrossCurrentMaturities Less: Long-term debt current portion Represents Silkstone Marine Corp. et al. loan agreement entered 2024. Silkstone Marine Corp. et al. Loan Agreement Entered 2024 [Member] Note 7 - Long-term Debt The tabular disclosure of financing costs associated with outstanding debts. Schedule of Financing Costs [Table Text Block] Note 7 - Long-term Debt - Annual Repayments (Details) Note 10 - Commitments and Contingencies Tabular disclosure of the long term time charter contracted revenue. Schedule of Non Cancelable Long-term Time Charter Contracts [Table Text Block] Note 8 - Operating Lease Right-of-use Assets and Liabilities Note 8 - Operating Lease Right-of-use Assets and Liabilities - Payments Required on Lease Liabilities (Details) Represents Strategic Cooperation Agreement. Strategic Cooperation Agreement [Member] Represents Cargill International S.A. ("Cargill") Cargill International S.A. ("Cargill") [Member] Represents the Framework Agreement and the Services Agreement. Framework Agreement and the Services Agreement [Member] Represents Costamare Inc. Costamare Inc. [Member] Represents Neptune Maritime Leasing Limited ("NML"). Neptune Maritime Leasing Limited ("NML") [Member] Neptune Maritime Leasing Limited ("NML") [Member] Represents Local Agency A, Local Agency B, Local Agency C, and Local Agency D. Local Agency A, Local Agency B, Local Agency C, and Local Agency D [Member] Represents Local Agencies A, B and D. Local Agencies A, B and D [Member] Represents Costamare Shipping Company S.A. ("Costamare Shipping") and Costamare Shipping Services Ltd. ("Costamare Services"). Costamare Shipping Company S.A. (Costamare Shipping) and Costamare Shipping Services Ltd. (Costamare Services) [Member] Represents Costamare Shipping Services Ltd. ("Costamare Services"). Costamare Shipping Services Ltd. ("Costamare Services") [Member] Represents chartering-in vessels activity. Chartering-in Vessels Activity [Member] Represents agency agreements. Agency Agreements [Member] Represents loan agreements. Loan Agreements [Member] Represents Costamare Bulkers Services Pte. Ltd. ("Local Agency C"). Costamare Bulkers Services Pte. Ltd. ("Local Agency C") [Member] Factor of aggregate fees to determine terminate fees under agreement. cmdb_AgreementTerminationFeeFactorOfAggregateFees Agreement, Termination Fee, Factor of Aggregate Fees The total amount hold by a third party manager as working capital security in accordance with the management agreement between the reporting entity and the third party manager, classified as current. cmdb_WorkingCapitalSecurityCurrent Working Capital Security, Current Period of subsequent term for termination under agreement. cmdb_AgreementSubsequentTermForTermination Agreement, Subsequent Term for Termination (Year) Quarterly fee for services provided by related party as at period end. cmdb_QuarterlyFeeToRelatedParties Quarterly Fee to Related Parties The per vessel amount hold by a third party manager as working capital security in accordance with the management agreement between the reporting entity and the third party manager. cmdb_WorkingCapitalSecurityPerVessel Working Capital Security Per Vessel Expenses paid to related parties primarily consisting of commissions and fees, which are paid for by the company, regardless of the charter type. cmdb_VoyageExpensesRelatedParties Voyage Expenses, Related Parties The total amount hold by a third party manager as working capital security in accordance with the management agreement between the reporting entity and the third party manager, classified as noncurrent. cmdb_WorkingCapitalSecurityNoncurrent Working Capital Security, Noncurrent Term of the agreement for termination. cmdb_AgreementTermForTermination Agreement, Term for Termination (Month) The number of loan agreements. cmdb_NumberOfLoanAgreements Number of Loan Agreements The total amount hold by a third party manager as working capital security in accordance with the management agreement between the reporting entity and the third party manager. cmdb_WorkingCapitalSecurity Working Capital Security Quarterly fee, in shares, for services provided by related party as at period end. cmdb_QuarterlyFeeToRelatedPartiesShares Quarterly Fee to Related Parties, Shares (in shares) Represents the fair value of shares issued to managers. cmdb_FairValueOfSharesIssuedToManager Fair Value of Shares Issued to Manager Fees paid to related parties for providing the company with technical, crewing, bunkering, accounting, provisions, sale, purchase services, as well as general administrative, certain commercial services, director and officer related insurance services. cmdb_ManagementFeesRelatedParties Management Fees, Related Parties This item represents the commission as a percentage paid to Managers on charter hire agreements. cmdb_CommissionChargedOnCharterHireAgreements Commission Charged on Charter Hire Agreements Minimum termination fee under agreement. cmdb_AgreementTerminationFeeMinimum Agreement, Termination Fee, Minimum Period of advance notice for termination of the agreement. cmdb_AgreementTerminationAdvanceNoticePeriod Agreement, Termination , Advance Notice Period (Month) Period following sale for management fee per day. cmdb_ManagementFeePerDayPeriodFollowingSale Management Fee Per Day, Period Following Sale (Month) Represents Navilands Bulker Management Ltd., ('"Navilands'"). Navilands Bulker Management Ltd., (''Navilands'') [Member] Represents the amount paid to third party managers. cmdb_AmountsPaidToThirdPartyManagers Amounts Paid to Third Party Managers Portion of expenditures for salaries of officers charged at period end. Does not include allocated share-based compensation, pension and post-retirement benefit expense or other labor-related non-salary expense. For commercial and industrial companies, excludes any direct and overhead labor that is included in cost of goods sold. cmdb_OfficersCompensationChargedPeriodEnd Officers Compensation Charged, Period End The amount of management fee per day, per vessel under bareboat charter. cmdb_ManagementFeePerDayPerVesselUnderBareboatCharter Management Fee Per Day, Per Vessel Under Bareboat Charter Represents Navilands Bulker Management Ltd., ("Navilands") and Navilands (Shanghai) Bulkers Management Ltd. ("Navilands (Shanghai)"). Navilands Bulker Management Ltd., ('Navilands') and Navilands (Shanghai) Bulkers Management Ltd. ('Navilands (Shanghai)') [Member] Navilands Bulker Management Ltd., ('Navilands') and Navilands (Shanghai) Bulkers Management Ltd. ('Navilands (Shanghai)') [Member] The amount of management fee per day per vessel. cmdb_ManagementFeePerDayPerVessel Management Fee Per Day, Per Vessel Percentage of markup for costs. cmdb_MarkupForCosts Markup for Costs Number of handysize bulkers sold. cmdb_NumberOfHandysizeBulkersSold Number of Handysize Bulkers Sold This item represents the commission payable to Managers upfront in lieu of the fixed management fee. cmdb_ConstructionSupervisoryFee Construction Supervisory Fee Represents Costamare Shipping Company S.A. ("Costamare Shipping"). Costamare Shipping Company S.A. ("Costamare Shipping") [Member] Represents acquisition by third parties. Acquisition by Third Parties [Member] Represents certain of the Costamare's subsidiaries, Costamare, CMDB and CBSI. Certain of the Costamare's subsidiaries, Costamare, CMDB and CBSI [Member] The number of installments for payments under the debt instrument. cmdb_DebtInstrumentNumberOfInstallments Debt Instrument, Number of Installments The required fair market value of vessels in relation to the outstanding principal amount on loans. cmdb_TermLoanValueMaintenanceClauses Term Loan, Value Maintenance Clauses The number of tranches under the debt instrument. cmdb_DebtInstrumentNumberOfTranches Debt Instrument, Number of Tranches Represents loans payable, tranche B. Loans Payable, Tranche B [Member] Represents loans payable, tranche A. Loans Payable, Tranche A [Member] Note 10 - Commitments and Contingencies - Schedule of Time Charter Arrangements (Details) Note 16 - Derivatives Tabular disclosure of the gain and losses on derivative instruments not designated as hedging instruments that was recognized in the income statement during the current period. Schedule of Derivatives Not Designated as Hedging Instruments under ASC 815 [Table Text Block] Note 16 - Derivatives - Derivatives by Type (Details) Fair value, after effect of master netting arrangement and deduction of obligation to return financial collateral not offset and financial instrument subject to master netting arrangement not offset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and contract can be net settled by means outside contract or delivery of asset. Excludes derivative not subject to master netting arrangement or similar agreement. Classified as noncurrent. cmdb_DerivativeLiabilitySubjectToMasterNettingArrangementAfterOffsetAndDeductionNoncurrent Derivative liabilities, noncurrent Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and contract can be net settled by means outside contract or delivery of asset, subject to master netting arrangement or similar agreement and not elected or qualified to offset, deducted from derivative liability. Classified as current. Derivative liabilities, current, counterparty netting Fair value, after effect of master netting arrangement and deduction of obligation to return financial collateral not offset and financial instrument subject to master netting arrangement not offset, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and contract can be net settled by means outside contract or delivery of asset. Excludes derivative not subject to master netting arrangement or similar agreement. Classified as noncurrent. cmdb_DerivativeAssetSubjectToMasterNettingArrangementAfterOffsetAndDeductionNoncurrent Derivative assets, noncurrent Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. Classified as noncurrent. Derivative assets, noncurrent, gross Fair value, after effect of master netting arrangement and deduction of obligation to return financial collateral not offset and financial instrument subject to master netting arrangement not offset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and contract can be net settled by means outside contract or delivery of asset. Excludes derivative not subject to master netting arrangement or similar agreement. Classified as current. cmdb_DerivativeLiabilitySubjectToMasterNettingArrangementAfterOffsetAndDeductionCurrent Derivative liabilities, current Fair value, after effect of master netting arrangement and deduction of obligation to return financial collateral not offset and financial instrument subject to master netting arrangement not offset, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and contract can be net settled by means outside contract or delivery of asset. Excludes derivative not subject to master netting arrangement or similar agreement. Classified as current. cmdb_DerivativeAssetSubjectToMasterNettingArrangementAfterOffsetAndDeductionCurrent Derivative assets, current Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. Classified as current. Derivative assets, current, gross Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and contract can be net settled by means outside contract or delivery of asset, subject to master netting arrangement or similar agreement and not elected or qualified to offset, deducted from derivative liability. Classified as noncurrent. Derivative liabilities, noncurrent, counterparty netting Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. Classified as noncurrent. cmdb_DerivativeLiabilitySubjectToMasterNettingArrangementBeforeOffsetNoncurrent Derivative liabilities, noncurrent, gross Represents bunker swap agreements. Bunker Swap Agreements 2 [Member] Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and contract can be net settled by means outside contract or delivery of asset, subject to master netting arrangement or similar agreement and not elected or qualified to offset, deducted from derivative asset. Classified as noncurrent. cmdb_DerivativeAssetSubjectToMasterNettingArrangementDeductionOfFinancialInstrumentNotOffsetNoncurrent Derivative assets, noncurrent, counterparty netting Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and contract can be net settled by means outside contract or delivery of asset, subject to master netting arrangement or similar agreement and not elected or qualified to offset, deducted from derivative asset. Classified as current. cmdb_DerivativeAssetSubjectToMasterNettingArrangementDeductionOfFinancialInstrumentNotOffsetCurrent Derivative assets, current, counterparty netting Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. Classified as current. cmdb_DerivativeLiabilitySubjectToMasterNettingArrangementBeforeOffsetCurrent Derivative liabilities, current, gross Note 13 - Derivatives Tabular disclosure of the effective portion of the gains and losses on derivative instruments designated (and non-derivative instruments) designated and qualifying in cash flow hedges and net investment hedges that was recognized in other comprehensive income (loss) as well as the ineffective portion recognized in the income statement during the current period. Schedule of Derivatives In ASC 815 Cash Flow Hedging Relationships [Table Text Block] Number of entities included in common stock disclosures. cmdb_CommonStockNumberOfEntities Common Stock, Number of Entities Represents the Amoroto et al. loan agreement entered 2022. Amoroto et al. Loan Agreement Entered 2022 [Member] Represents Adstone Marine Corp. et al. loan agreement entered 2022. Adstone Marine Corp. et al. Loan Agreement Entered 2022 [Member] Represents the Bernis Marine Corp. et al. loan agreement entered 2021. Bernis Marine Corp. et al. Loan Agreement Entered 2021 [Member] Represents the Costamare loan agreement entered 2021. Costamare Loan Agreement Entered 2021 [Member] Represents Costamare loan agreement entered 2023. Costamare Loan Agreement Entered 2023 [Member] Represents the Bermondi Marine Corp. et al. loan agreement entered 2024. Bermondi Marine Corp. et al. Loan Agreement Entered 2024 [Member] Represents Amoroto et al. loan agreement entered 2021. Amoroto et al. Loan Agreement Entered 2021 [Member] Represents Barlestone Marine Corp. et al. loan agreement entered 2023. Barlestone Marine Corp. et al. Loan Agreement Entered 2023 [Member] Represents loans payable tranche C. Loans Payable, Tranche C [Member] Represents the Greneta Marine Corp. et al. loan agreement entered 2022. Greneta Marine Corp. et al. Loan Agreement Entered 2022 [Member] The entire disclosure for voyage revenues. Voyage Revenues [Text Block] Number of increase (decrease) in shares from capitalization at Spin-Off including issuance of stock. -Capitalization at Spin-Off including issuance of common stock (Notes 1 and 11) (in shares) Note 14 - Financial Instruments - Fair Value of Assets and Liabilities (Details) Note 10 - Voyage Revenues Tabular disclosure of voyage revenues. Schedule of Voyage Revenues [Table Text Block] Note 10 - Voyage Revenues - Schedule of Voyage Revenues (Details) Represents voyage charters and Contracts of Affreightment. Voyage Charters and Contracts of Affreightment [Member] Represents time charters. Time Charters [Member] Represents voyage charters. Voyage Charters [Member] Note 13 - Derivatives - Derivatives by Type (Details) Note 16 - Derivatives - Derivatives Not Designated as Hedging Instruments and Ineffectiveness of Hedging Instruments (Details) Related to two dry bulk vessels. Two Dry Bulk Vessels [Member] Related to one dry bulk vessel. One Dry Bulk Vessel [Member] Represents Resource. Resource [Member] Related to vessels. Konstantinos and Progress [Member] Description of voting rights of nonredeemable preferred stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights. cmdb_PreferredStockVotingRightsNumber Preferred Stock, Voting Rights, Number Represents Chief Commercial Officer. Chief Commercial Officer [Member] Represents members of the Konstantakopoulos Family. Members of the Konstantakopoulos Family [Member] the entire disclosure for charter-in arrangements. Charter-in Arrangements [Text Block] Note 13 - Derivatives - Derivatives Not Designated as Hedging Instruments and Ineffectiveness of Hedging Instruments (Details) Note 13 - Derivatives - Effect of Derivative Instruments (Details) The effective portion of changes in the fair value of cash flow hedges. cmdb_OtherComprehensiveIncomeLossDerivativeEffectivePortionOfChangesInFairValueNet Other Comprehensive Income (Loss), Derivative, Effective Portion of Changes in Fair Value, Net Period used for estimated time charter rate. cmdb_PeriodUsedForEstimatedTimeCharterRate Period Used for Estimated Time Charter Rate (Year) The number of chartered-in vessels. cmdb_NumberOfCharteredinVessels Number of Chartered-in Vessels This element represents the scrap rate (per lightwieght ton) used for the calculation of vessels' residual value. cmdb_EstimatedScrapRatePerLightweightTon Estimated Scrap Rate Per Lightweight Ton The number of vessels held-for-sale. cmdb_NumberOfVesselsHeldforsale Number of Vessels Held-for-sale The historical period used for average estimated daily time charter rate. cmdb_HistoricalPeriodUsedForAverageEstimatedDailyTimeCharterRate Historical Period Used for Average Estimated Daily Time Charter Rate (Year) Period of expected increase in expenses. cmdb_ExpectedIncreaseInExpensesPeriod Expected Increase in Expenses Period (Year) Amount of write-down of vessels recognized in the income statement. cmdb_VesselsImpairmentLoss Vessels Impairment Loss Represents dry bulk vessels. Dry Bulk Vessels [Member] Percentage of expected increase in expenses. cmdb_ExpectedIncreaseInExpensesPercentage Expected Increase in Expenses Percentage The number of subsidiaries owned by the entity. cmdb_NumberOfSubsidiaries Number of Subsidiaries Represents Costamare Bulkers Ships Inc. ("CBSI"). Costamare Bulkers Ships Inc. ("CBSI") [Member] Costamare Bulkers Ships Inc. ("CBSI") [Member] The number of controlled companies which will be used for future dry bulk vessel acquisitions. cmdb_NumberOfControlledCompaniesDryBulkVesselsTobeacquired Number of Controlled Companies, Dry Bulk Vessels To-be-acquired The number of additional Supramax vessels chartered. cmdb_NumberOfAdditionalSupramaxVesselsChartered Number of Additional Supramax Vessels Chartered Period of charter. cmdb_CharterPeriod Charter Period (Month) The number of controlled companies that currently own dry bulk vessels. Number of Controlled Companies Dry Bulk Vessels Owned Number of Controlled Companies, Dry Bulk Vessels Owned Represents Costamare Bulkers Inc. ("CBI"). Costamare Bulkers Inc. ("CBI") [Member] The number of dry bulk vessels. cmdb_NumberOfDryBulkVessels Number of Dry Bulk Vessels Information pertaining to the number of controlled entities. cmdb_NumberOfControlledCompanies Number of Controlled Companies The number of parent company shares per subsidiary share. cmdb_NumberOfParentCompanySharesPerSubsidiaryShare Number of Parent Company Shares Per Subsidiary Share The number of controlled companies that have previously owned and sold or have agreed to sell their dry bulk vessels. cmdb_NumberOfControlledCompaniesDryBulkVesselsPreviouslyOwnedOrTobesold Number of Controlled Companies, Dry Bulk Vessels Previously Owned or To-be-sold The number of chartered-in vessels not transferred,. cmdb_NumberOfCharteredinVesselsNotTransferred Number of Chartered-in Vessels Not Transferred Percentage of outstanding shares owned by related party. cmdb_RelatedPartyPercentageOfOutstandingShares Related Party, Percentage of Outstanding Shares Note 13 - Total Voyage Revenues Amount of expenses relating to charter-in hire. cmdb_ChartinHireExpenses Chart-in Hire Expenses The number of vessels chartered-in during period. cmdb_NumberOfVesselsCharteredinDuringPeriod Number of Vessels Chartered-in During Period Note 13 - Total Voyage Revenues - Schedule of Voyage Revenues (Details) Note 7 - Long-term Debt - Schedule of Long-term Debt 1 (Details) Note 5 - Vessels, Net Tabular disclosure of the cost and accumulated depreciation of vessels that are used in the normal conduct of business to produce goods and services and not intended for resale and advances for vessel acquisitions and or vessels under construction. Schedule of Vessels and Advances, Net [Table Text Block] Note 2 - Significant Accounting Policies and Recent Accounting Pronouncements 1 Tabular disclosure of cash and cash equivalents unrestricted and restricted as to withdrawal or usage. Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Table Text Block] Note 2 - Significant Accounting Policies and Recent Accounting Pronouncements The number of chartered-in vessels on a time charter trip. cmdb_NumberOfCharteredinVesselsOnATimeCharterTrip Number of Chartered-in Vessels on a Time Charter Trip The number of vessels acquired during the period. cmdb_NumberOfVesselsAcquiredDuringPeriod Number of Vessels Acquired During Period The number of vessels impaired. cmdb_NumberOfVesselsImpaired Number of Vessels Impaired Represents Miracle (ex. Iron Miracle), Prosper (ex. Lowlands Prosperity), Frontier (ex. Frontier Unity), Magnes (ex. Nord Magnes), Alwine (ex. Alwine Oldendorff) and August (ex. August Oldendorff). Miracle, Prosper, Frontier, Magnes, Alwine, and August [Member] Represents Miner, Taibo, Comity, Peace, Pride and Cetus. Miner, Taibo, Comity, Peace, Pride and Cetus [Member] Represents Alliance, Merida, Pegasus, Oracle, Titan I and Discovery. Alliance, Merida, Pegasus, Oracle, Titan I and Discovery [Member]