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Vessel Operating Expenses and Voyage Expenses (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Vessel Operating Expenses [Abstract] |  |  |
Crew & crew related costs | $ 21,790,625 | $ 21,567,463 | $ 14,494,527
Repairs & maintenance, spares, stores, classification, chemicals & gases, paints, victualling | 10,387,925 | 11,289,623 | 6,661,392
Lubricants | 2,748,208 | 2,476,027 | 1,774,852
Insurances | 3,503,257 | 3,286,750 | 2,250,295
Tonnage taxes | 872,702 | 885,881 | 445,132
Other | 2,610,911 | 1,753,810 | 1,215,402
Total Vessel operating expenses | 41,913,628 | 41,259,554 | 26,841,600
Voyage Expenses [Abstract] |  |  |
Brokerage commissions | 1,900,940 | 1,842,495 | 1,212,587
Brokerage commissions- related party | 1,274,384 | 1,944,288 | 1,299,108
Port & other expenses | 615,838 | 858,827 | 604,537
Bunkers consumption | 1,114,356 | 2,713,216 | 1,490,825
(Gain) / loss on bunkers | 146,710 | (3,637,549) | (2,715,792)
Total Voyage expenses | $ 5,052,228 | $ 3,721,277 | $ 1,891,265

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- Definition Commissions paid to brokers for time-charter and voyage-charter arrangements. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Commissions paid to related party for time-charter and voyage-charter arrangements. + References No definition available. + Details
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Namespace Prefix: | ctrm_
Data Type: | xbrli:monetaryItemType
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- Definition Amount of bunkers (or energy) consumption related to fuel stored on a ship and used as fuel for machinery operation. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The amount of loss (gain) on bunker fuel during the period. The gain or loss is the difference between the cost of bunker fuel delivered by the terminating charterer and the bunker fuel sold to the new charterer. + References No definition available. + Details
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Balance Type: | debit
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- Definition Amount of operating expense for lubricants. + References No definition available. + Details
Name: | ctrm_LubricantExpenses
Namespace Prefix: | ctrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Fixed charges, such as wharfage, towage, and pilotage, levied against a ship or its cargo in port and other expenses. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of operating expenses for vessel repair and maintenance, spares, stores, classification, chemicals and gases, paints and victualling. + References No definition available. + Details
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Namespace Prefix: | ctrm_
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Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- Definition Voyage expenses consist of: (a) port, canal and bunker expenses that are unique to a particular charter which are paid for by the charterer under the time charter arrangements or by the Company under voyage charter arrangements, and (b) brokerage commissions, which are always paid for by the Company, regardless of charter type. + References No definition available. + Details
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Balance Type: | debit
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- Definition The expense in the period incurred with respect to protection provided by insurance entities against risks other than risks associated with production (which are allocated to cost of sales). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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- Definition Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense. + References No definition available. + Details
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- Definition The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(7)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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- Definition All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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