3.26.1 html 181 255 1 true 72 0 false 9 false false R1.htm 000100 - Document - Document and Entity Information Sheet http://unitedmaritime.gr/role/DocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 010000 - Statement - Condensed Consolidated Balance Sheets Sheet http://unitedmaritime.gr/role/CondensedConsolidatedBalanceSheets Condensed Consolidated Balance Sheets Statements 2 false false R3.htm 010100 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) Sheet http://unitedmaritime.gr/role/CondensedConsolidatedBalanceSheetsParenthetical Condensed Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 020000 - Statement - Unaudited Interim Condensed Consolidated Statement of Operations Sheet http://unitedmaritime.gr/role/UnauditedInterimCondensedConsolidatedStatementOfOperations Unaudited Interim Condensed Consolidated Statement of Operations Statements 4 false false R5.htm 030000 - Statement - Unaudited Interim Condensed Consolidated Statement of Other Comprehensive Income / (Loss) Sheet http://unitedmaritime.gr/role/UnauditedInterimCondensedConsolidatedStatementOfOtherComprehensiveIncomeLoss Unaudited Interim Condensed Consolidated Statement of Other Comprehensive Income / (Loss) Statements 5 false false R6.htm 040000 - Statement - Unaudited Interim Condensed Consolidated Statement of Stockholders' Equity Sheet http://unitedmaritime.gr/role/UnauditedInterimCondensedConsolidatedStatementOfStockholdersEquity Unaudited Interim Condensed Consolidated Statement of Stockholders' Equity Statements 6 false false R7.htm 050000 - Statement - Unaudited Interim Condensed Consolidated Statement of Cash Flows Sheet http://unitedmaritime.gr/role/UnauditedInterimCondensedConsolidatedStatementOfCashFlows Unaudited Interim Condensed Consolidated Statement of Cash Flows Statements 7 false false R8.htm 060100 - Disclosure - Basis of Presentation and General Information Sheet http://unitedmaritime.gr/role/BasisOfPresentationAndGeneralInformation Basis of Presentation and General Information Notes 8 false false R9.htm 060200 - Disclosure - Significant Accounting Policies Sheet http://unitedmaritime.gr/role/SignificantAccountingPolicies Significant Accounting Policies Notes 9 false false R10.htm 060300 - Disclosure - Transactions with Related Parties Sheet http://unitedmaritime.gr/role/TransactionsWithRelatedParties Transactions with Related Parties Notes 10 false false R11.htm 060400 - Disclosure - Cash and Cash Equivalents and Restricted Cash Sheet http://unitedmaritime.gr/role/CashAndCashEquivalentsAndRestrictedCash Cash and Cash Equivalents and Restricted Cash Notes 11 false false R12.htm 060500 - Disclosure - Vessels, Net Sheet http://unitedmaritime.gr/role/VesselsNet Vessels, Net Notes 12 false false R13.htm 060600 - Disclosure - Right-of-Use Assets and Finance Lease Liabilities Sheet http://unitedmaritime.gr/role/RightofuseAssetsAndFinanceLeaseLiabilities Right-of-Use Assets and Finance Lease Liabilities Notes 13 false false R14.htm 060700 - Disclosure - Long-Term Debt and Other Financial Liabilities Sheet http://unitedmaritime.gr/role/LongtermDebtAndOtherFinancialLiabilities Long-Term Debt and Other Financial Liabilities Notes 14 false false R15.htm 060800 - Disclosure - Equity Method Investments Sheet http://unitedmaritime.gr/role/EquityMethodInvestments Equity Method Investments Notes 15 false false R16.htm 060900 - Disclosure - Acquisition of RGI Sheet http://unitedmaritime.gr/role/AcquisitionOfRgi Acquisition of RGI Notes 16 false false R17.htm 061000 - Disclosure - Financial Instruments Sheet http://unitedmaritime.gr/role/FinancialInstruments Financial Instruments Notes 17 false false R18.htm 061100 - Disclosure - Commitments and Contingencies Sheet http://unitedmaritime.gr/role/CommitmentsAndContingencies Commitments and Contingencies Notes 18 false false R19.htm 061200 - Disclosure - Capital Structure Sheet http://unitedmaritime.gr/role/CapitalStructure Capital Structure Notes 19 false false R20.htm 061300 - Disclosure - Vessel Revenue, net and Voyage Expenses Sheet http://unitedmaritime.gr/role/VesselRevenueNetAndVoyageExpenses Vessel Revenue, net and Voyage Expenses Notes 20 false false R21.htm 061400 - Disclosure - Interest and Finance Costs Sheet http://unitedmaritime.gr/role/InterestAndFinanceCosts Interest and Finance Costs Notes 21 false false R22.htm 061500 - Disclosure - Earnings / (loss) per Share Sheet http://unitedmaritime.gr/role/EarningsLossPerShare Earnings / (loss) per Share Notes 22 false false R23.htm 061600 - Disclosure - Equity Incentive Plan Sheet http://unitedmaritime.gr/role/EquityIncentivePlan Equity Incentive Plan Notes 23 false false R24.htm 061700 - Disclosure - Subsequent Events Sheet http://unitedmaritime.gr/role/SubsequentEvents Subsequent Events Notes 24 false false R25.htm 070100 - Disclosure - Basis of Presentation and General Information (Policies) Sheet http://unitedmaritime.gr/role/BasisOfPresentationAndGeneralInformationPolicies Basis of Presentation and General Information (Policies) Policies http://unitedmaritime.gr/role/SignificantAccountingPolicies 25 false false R26.htm 070200 - Disclosure - Significant Accounting Policies (Policies) Sheet http://unitedmaritime.gr/role/SignificantAccountingPoliciesPolicies Significant Accounting Policies (Policies) Policies http://unitedmaritime.gr/role/SignificantAccountingPolicies 26 false false R27.htm 080100 - Disclosure - Basis of Presentation and General Information (Tables) Sheet http://unitedmaritime.gr/role/BasisOfPresentationAndGeneralInformationTables Basis of Presentation and General Information (Tables) Tables http://unitedmaritime.gr/role/BasisOfPresentationAndGeneralInformation 27 false false R28.htm 080300 - Disclosure - Transactions with Related Parties (Tables) Sheet http://unitedmaritime.gr/role/TransactionsWithRelatedPartiesTables Transactions with Related Parties (Tables) Tables http://unitedmaritime.gr/role/TransactionsWithRelatedParties 28 false false R29.htm 080400 - Disclosure - Cash and Cash Equivalents and Restricted Cash (Tables) Sheet http://unitedmaritime.gr/role/CashAndCashEquivalentsAndRestrictedCashTables Cash and Cash Equivalents and Restricted Cash (Tables) Tables http://unitedmaritime.gr/role/CashAndCashEquivalentsAndRestrictedCash 29 false false R30.htm 080500 - Disclosure - Vessels, Net (Tables) Sheet http://unitedmaritime.gr/role/VesselsNetTables Vessels, Net (Tables) Tables http://unitedmaritime.gr/role/VesselsNet 30 false false R31.htm 080600 - Disclosure - Right-of-Use Assets and Finance Lease Liabilities (Tables) Sheet http://unitedmaritime.gr/role/RightofuseAssetsAndFinanceLeaseLiabilitiesTables Right-of-Use Assets and Finance Lease Liabilities (Tables) Tables http://unitedmaritime.gr/role/RightofuseAssetsAndFinanceLeaseLiabilities 31 false false R32.htm 080700 - Disclosure - Long-Term Debt and Other Financial Liabilities (Tables) Sheet http://unitedmaritime.gr/role/LongtermDebtAndOtherFinancialLiabilitiesTables Long-Term Debt and Other Financial Liabilities (Tables) Tables http://unitedmaritime.gr/role/LongtermDebtAndOtherFinancialLiabilities 32 false false R33.htm 081100 - Disclosure - Commitments and Contingencies (Tables) Sheet http://unitedmaritime.gr/role/CommitmentsAndContingenciesTables Commitments and Contingencies (Tables) Tables http://unitedmaritime.gr/role/CommitmentsAndContingencies 33 false false R34.htm 081300 - Disclosure - Vessel Revenue, net and Voyage Expenses (Tables) Sheet http://unitedmaritime.gr/role/VesselRevenueNetAndVoyageExpensesTables Vessel Revenue, net and Voyage Expenses (Tables) Tables http://unitedmaritime.gr/role/VesselRevenueNetAndVoyageExpenses 34 false false R35.htm 081400 - Disclosure - Interest and Finance Costs (Tables) Sheet http://unitedmaritime.gr/role/InterestAndFinanceCostsTables Interest and Finance Costs (Tables) Tables http://unitedmaritime.gr/role/InterestAndFinanceCosts 35 false false R36.htm 081500 - Disclosure - Earnings / (loss) per Share (Tables) Sheet http://unitedmaritime.gr/role/EarningsLossPerShareTables Earnings / (loss) per Share (Tables) Tables http://unitedmaritime.gr/role/EarningsLossPerShare 36 false false R37.htm 090100 - Disclosure - Basis of Presentation and General Information (Details) Sheet http://unitedmaritime.gr/role/BasisOfPresentationAndGeneralInformationDetails Basis of Presentation and General Information (Details) Details http://unitedmaritime.gr/role/BasisOfPresentationAndGeneralInformationTables 37 false false R38.htm 090202 - Disclosure - Significant Accounting Policies (Details) Sheet http://unitedmaritime.gr/role/SignificantAccountingPoliciesDetails Significant Accounting Policies (Details) Details http://unitedmaritime.gr/role/SignificantAccountingPoliciesPolicies 38 false false R39.htm 090300 - Disclosure - Transactions with Related Parties (Details) Sheet http://unitedmaritime.gr/role/TransactionsWithRelatedPartiesDetails Transactions with Related Parties (Details) Details http://unitedmaritime.gr/role/TransactionsWithRelatedPartiesTables 39 false false R40.htm 090302 - Disclosure - Transactions with Related Parties, Management Fees (Details) Sheet http://unitedmaritime.gr/role/TransactionsWithRelatedPartiesManagementFeesDetails Transactions with Related Parties, Management Fees (Details) Details 40 false false R41.htm 090304 - Disclosure - Transactions with Related Parties, Fees from Management Agreement (Details) Sheet http://unitedmaritime.gr/role/TransactionsWithRelatedPartiesFeesFromManagementAgreementDetails Transactions with Related Parties, Fees from Management Agreement (Details) Details 41 false false R42.htm 090306 - Disclosure - Transactions with Related Parties, Due to Related Parties (Details) Sheet http://unitedmaritime.gr/role/TransactionsWithRelatedPartiesDueToRelatedPartiesDetails Transactions with Related Parties, Due to Related Parties (Details) Details 42 false false R43.htm 090308 - Disclosure - Transactions with Related Parties, Due from Related Parties (Details) Sheet http://unitedmaritime.gr/role/TransactionsWithRelatedPartiesDueFromRelatedPartiesDetails Transactions with Related Parties, Due from Related Parties (Details) Details 43 false false R44.htm 090400 - Disclosure - Cash and Cash Equivalents and Restricted Cash (Details) Sheet http://unitedmaritime.gr/role/CashAndCashEquivalentsAndRestrictedCashDetails Cash and Cash Equivalents and Restricted Cash (Details) Details http://unitedmaritime.gr/role/CashAndCashEquivalentsAndRestrictedCashTables 44 false false R45.htm 090500 - Disclosure - Vessels, Net, Net Book Value (Details) Sheet http://unitedmaritime.gr/role/VesselsNetNetBookValueDetails Vessels, Net, Net Book Value (Details) Details 45 false false R46.htm 090502 - Disclosure - Vessels, Net (Details) Sheet http://unitedmaritime.gr/role/VesselsNetDetails Vessels, Net (Details) Details http://unitedmaritime.gr/role/VesselsNetTables 46 false false R47.htm 090600 - Disclosure - Right-of-Use Assets and Finance Lease Liabilities (Details) Sheet http://unitedmaritime.gr/role/RightofuseAssetsAndFinanceLeaseLiabilitiesDetails Right-of-Use Assets and Finance Lease Liabilities (Details) Details http://unitedmaritime.gr/role/RightofuseAssetsAndFinanceLeaseLiabilitiesTables 47 false false R48.htm 090700 - Disclosure - Long-Term Debt and Other Financial Liabilities, Summary of Long-Term Debt (Details) Sheet http://unitedmaritime.gr/role/LongtermDebtAndOtherFinancialLiabilitiesSummaryOfLongtermDebtDetails Long-Term Debt and Other Financial Liabilities, Summary of Long-Term Debt (Details) Details 48 false false R49.htm 090702 - Disclosure - Long-Term Debt and Other Financial Liabilities, Squireship Huarong Bareboat Charter Arrangement (Details) Sheet http://unitedmaritime.gr/role/LongtermDebtAndOtherFinancialLiabilitiesSquireshipHuarongBareboatCharterArrangementDetails Long-Term Debt and Other Financial Liabilities, Squireship Huarong Bareboat Charter Arrangement (Details) Details 49 false false R50.htm 090704 - Disclosure - Long-Term Debt and Other Financial Liabilities, Nisea Huarong Sale and Leaseback (Details) Sheet http://unitedmaritime.gr/role/LongtermDebtAndOtherFinancialLiabilitiesNiseaHuarongSaleAndLeasebackDetails Long-Term Debt and Other Financial Liabilities, Nisea Huarong Sale and Leaseback (Details) Details 50 false false R51.htm 090706 - Disclosure - Long-Term Debt and Other Financial Liabilities, April 2023 Neptune Sale and Leaseback (Details) Sheet http://unitedmaritime.gr/role/LongtermDebtAndOtherFinancialLiabilitiesApril2023NeptuneSaleAndLeasebackDetails Long-Term Debt and Other Financial Liabilities, April 2023 Neptune Sale and Leaseback (Details) Details 51 false false R52.htm 090708 - Disclosure - Long-Term Debt and Other Financial Liabilities, Collateral (Details) Sheet http://unitedmaritime.gr/role/LongtermDebtAndOtherFinancialLiabilitiesCollateralDetails Long-Term Debt and Other Financial Liabilities, Collateral (Details) Details 52 false false R53.htm 090710 - Disclosure - Long-Term Debt and Other Financial Liabilities, Annual Principal Payments (Details) Sheet http://unitedmaritime.gr/role/LongtermDebtAndOtherFinancialLiabilitiesAnnualPrincipalPaymentsDetails Long-Term Debt and Other Financial Liabilities, Annual Principal Payments (Details) Details 53 false false R54.htm 090800 - Disclosure - Equity Method Investments (Details) Sheet http://unitedmaritime.gr/role/EquityMethodInvestmentsDetails Equity Method Investments (Details) Details http://unitedmaritime.gr/role/EquityMethodInvestments 54 false false R55.htm 090900 - Disclosure - Acquisition of RGI (Details) Sheet http://unitedmaritime.gr/role/AcquisitionOfRgiDetails Acquisition of RGI (Details) Details http://unitedmaritime.gr/role/AcquisitionOfRgi 55 false false R56.htm 091000 - Disclosure - Financial Instruments (Details) Sheet http://unitedmaritime.gr/role/FinancialInstrumentsDetails Financial Instruments (Details) Details http://unitedmaritime.gr/role/FinancialInstruments 56 false false R57.htm 091100 - Disclosure - Commitments and Contingencies (Details) Sheet http://unitedmaritime.gr/role/CommitmentsAndContingenciesDetails Commitments and Contingencies (Details) Details http://unitedmaritime.gr/role/CommitmentsAndContingenciesTables 57 false false R58.htm 091200 - Disclosure - Capital Structure, Dividends (Details) Sheet http://unitedmaritime.gr/role/CapitalStructureDividendsDetails Capital Structure, Dividends (Details) Details 58 false false R59.htm 091202 - Disclosure - Capital Structure, Warrants (Details) Sheet http://unitedmaritime.gr/role/CapitalStructureWarrantsDetails Capital Structure, Warrants (Details) Details 59 false false R60.htm 091204 - Disclosure - Capital Structure, Common Stock Buybacks (Details) Sheet http://unitedmaritime.gr/role/CapitalStructureCommonStockBuybacksDetails Capital Structure, Common Stock Buybacks (Details) Details 60 false false R61.htm 091300 - Disclosure - Vessel Revenue, net and Voyage Expenses, Income Derived from Charters (Details) Sheet http://unitedmaritime.gr/role/VesselRevenueNetAndVoyageExpensesIncomeDerivedFromChartersDetails Vessel Revenue, net and Voyage Expenses, Income Derived from Charters (Details) Details 61 false false R62.htm 091302 - Disclosure - Vessel Revenue, net and Voyage Expenses, Net Trade Accounts Receivable Disaggregated by Revenue Source (Details) Sheet http://unitedmaritime.gr/role/VesselRevenueNetAndVoyageExpensesNetTradeAccountsReceivableDisaggregatedByRevenueSourceDetails Vessel Revenue, net and Voyage Expenses, Net Trade Accounts Receivable Disaggregated by Revenue Source (Details) Details 62 false false R63.htm 091304 - Disclosure - Vessel Revenue, net and Voyage Expenses, Revenue from Charterers (Details) Sheet http://unitedmaritime.gr/role/VesselRevenueNetAndVoyageExpensesRevenueFromCharterersDetails Vessel Revenue, net and Voyage Expenses, Revenue from Charterers (Details) Details 63 false false R64.htm 091306 - Disclosure - Vessel Revenue, net and Voyage Expenses, Voyage Expenses from Charters (Details) Sheet http://unitedmaritime.gr/role/VesselRevenueNetAndVoyageExpensesVoyageExpensesFromChartersDetails Vessel Revenue, net and Voyage Expenses, Voyage Expenses from Charters (Details) Details 64 false false R65.htm 091400 - Disclosure - Interest and Finance Costs (Details) Sheet http://unitedmaritime.gr/role/InterestAndFinanceCostsDetails Interest and Finance Costs (Details) Details http://unitedmaritime.gr/role/InterestAndFinanceCostsTables 65 false false R66.htm 091500 - Disclosure - Earnings / (loss) per Share (Details) Sheet http://unitedmaritime.gr/role/EarningsLossPerShareDetails Earnings / (loss) per Share (Details) Details http://unitedmaritime.gr/role/EarningsLossPerShareTables 66 false false R67.htm 091600 - Disclosure - Equity Incentive Plan (Details) Sheet http://unitedmaritime.gr/role/EquityIncentivePlanDetails Equity Incentive Plan (Details) Details http://unitedmaritime.gr/role/EquityIncentivePlan 67 false false R68.htm 091700 - Disclosure - Subsequent Events (Details) Sheet http://unitedmaritime.gr/role/SubsequentEventsDetails Subsequent Events (Details) Details http://unitedmaritime.gr/role/SubsequentEvents 68 false false All Reports Book All Reports ef20075473_ex99-2.htm usea-20260630.xsd usea-20260630_cal.xml usea-20260630_def.xml usea-20260630_lab.xml usea-20260630_pre.xml http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/dei/2025 true true