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Vessel Operating and Voyage Expenses (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Vessel Operating Expenses [Abstract] |  |  |
Crew & crew related costs | $ 21,532,311 | $ 3,753,578 | $ 1,396,477
Repairs & maintenance, spares, stores, classification, chemicals & gases, paints, victualling | 9,828,139 | 2,314,260 | 868,915
Lubricants | 2,375,901 | 429,967 | 153,969
Insurances | 3,126,169 | 507,885 | 189,781
Tonnage taxes | 592,701 | 131,674 | 50,553
Other | 1,748,250 | 310,075 | 143,296
Total Vessel operating expenses | 39,203,471 | 7,447,439 | 2,802,991
Voyage Expenses [Abstract] |  |  |
Brokerage commissions | 1,733,639 | 158,538 | 46,708
Brokerage commissions- related party | 1,671,145 | 29,769 | 40,471
Port & other expenses | 4,520,584 | 173,645 | 46,100
Bunkers consumption | 7,742,450 | 321,252 | 87,760
Loss/(Gain) on bunkers | (2,717,035) | (98,499) | 40,140
Total Voyage expenses | $ 12,950,783 | $ 584,705 | $ 261,179

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- Definition Commissions paid to brokers for time-charter and voyage-charter arrangements. + References No definition available. + Details
Name: | ctrm_BrokerageCommissions
Namespace Prefix: | ctrm_
Data Type: | xbrli:monetaryItemType
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
Name: | ctrm_BrokerageCommissionsRelatedParty
Namespace Prefix: | ctrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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
Name: | ctrm_BunkersConsumption
Namespace Prefix: | ctrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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
Name: | ctrm_LossGainOnBunkerFuel
Namespace Prefix: | ctrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | ctrm_PortAndOtherExpenses
Namespace Prefix: | ctrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- References No definition available. + Details
Name: | ctrm_VoyageExpenseAbstract
Namespace Prefix: | ctrm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | ctrm_VoyageExpenses
Namespace Prefix: | ctrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
Name: | us-gaap_GeneralInsuranceExpense
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(4)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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Balance Type: | debit
Period Type: | duration

X
- 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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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(4)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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