3.24.1 html 456 488 1 false 163 0 false 21 false false R1.htm 000100 - Document - Document and Entity Information Sheet http://seanergymaritime.com/role/DocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 010000 - Statement - Consolidated Balance Sheets Sheet http://seanergymaritime.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 010100 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://seanergymaritime.com/role/ConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 020000 - Statement - Consolidated Statements of Income Sheet http://seanergymaritime.com/role/ConsolidatedStatementsOfIncome Consolidated Statements of Income Statements 4 false false R5.htm 020100 - Statement - Consolidated Statements of Income (Parenthetical) Sheet http://seanergymaritime.com/role/ConsolidatedStatementsOfIncomeParenthetical Consolidated Statements of Income (Parenthetical) Statements 5 false false R6.htm 030000 - Statement - Consolidated Statements of Stockholders' Equity Sheet http://seanergymaritime.com/role/ConsolidatedStatementsOfStockholdersEquity Consolidated Statements of Stockholders' Equity Statements 6 false false R7.htm 030100 - Statement - Consolidated Statements of Stockholders' Equity (Parenthetical) Sheet http://seanergymaritime.com/role/ConsolidatedStatementsOfStockholdersEquityParenthetical Consolidated Statements of Stockholders' Equity (Parenthetical) Statements 7 false false R8.htm 040000 - Statement - Consolidated Statements of Cash Flows Sheet http://seanergymaritime.com/role/ConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 8 false false R9.htm 060100 - Disclosure - Basis of Presentation and General Information Sheet http://seanergymaritime.com/role/BasisOfPresentationAndGeneralInformation Basis of Presentation and General Information Notes 9 false false R10.htm 060200 - Disclosure - Significant Accounting Policies Sheet http://seanergymaritime.com/role/SignificantAccountingPolicies Significant Accounting Policies Notes 10 false false R11.htm 060300 - Disclosure - Transactions with Related Parties Sheet http://seanergymaritime.com/role/TransactionsWithRelatedParties Transactions with Related Parties Notes 11 false false R12.htm 060400 - Disclosure - Cash and Cash Equivalents and Restricted Cash Sheet http://seanergymaritime.com/role/CashAndCashEquivalentsAndRestrictedCash Cash and Cash Equivalents and Restricted Cash Notes 12 false false R13.htm 060500 - Disclosure - Inventories Sheet http://seanergymaritime.com/role/Inventories Inventories Notes 13 false false R14.htm 060600 - Disclosure - Vessels, Net Sheet http://seanergymaritime.com/role/VesselsNet Vessels, Net Notes 14 false false R15.htm 060700 - Disclosure - Finance Lease, Right-of-use Assets and Finance Lease Liabilities Sheet http://seanergymaritime.com/role/FinanceLeaseRightofuseAssetsAndFinanceLeaseLiabilities Finance Lease, Right-of-use Assets and Finance Lease Liabilities Notes 15 false false R16.htm 060800 - Disclosure - Long-Term Debt and Other Financial Liabilities Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilities Long-Term Debt and Other Financial Liabilities Notes 16 false false R17.htm 060900 - Disclosure - Convertible Notes Notes http://seanergymaritime.com/role/ConvertibleNotes Convertible Notes Notes 17 false false R18.htm 061000 - Disclosure - Financial Instruments Sheet http://seanergymaritime.com/role/FinancialInstruments Financial Instruments Notes 18 false false R19.htm 061100 - Disclosure - Commitments and Contingencies Sheet http://seanergymaritime.com/role/CommitmentsAndContingencies Commitments and Contingencies Notes 19 false false R20.htm 061200 - Disclosure - Capital Structure Sheet http://seanergymaritime.com/role/CapitalStructure Capital Structure Notes 20 false false R21.htm 061300 - Disclosure - Vessel Revenue and Voyage Expenses Sheet http://seanergymaritime.com/role/VesselRevenueAndVoyageExpenses Vessel Revenue and Voyage Expenses Notes 21 false false R22.htm 061400 - Disclosure - Interest and Finance Costs Sheet http://seanergymaritime.com/role/InterestAndFinanceCosts Interest and Finance Costs Notes 22 false false R23.htm 061500 - Disclosure - Earnings per Share Sheet http://seanergymaritime.com/role/EarningsPerShare Earnings per Share Notes 23 false false R24.htm 061600 - Disclosure - Equity Incentive Plan Sheet http://seanergymaritime.com/role/EquityIncentivePlan Equity Incentive Plan Notes 24 false false R25.htm 061700 - Disclosure - Subsequent Events Sheet http://seanergymaritime.com/role/SubsequentEvents Subsequent Events Notes 25 false false R26.htm 070200 - Disclosure - Significant Accounting Policies (Policies) Sheet http://seanergymaritime.com/role/SignificantAccountingPoliciesPolicies Significant Accounting Policies (Policies) Policies http://seanergymaritime.com/role/SignificantAccountingPolicies 26 false false R27.htm 080100 - Disclosure - Basis of Presentation and General Information (Tables) Sheet http://seanergymaritime.com/role/BasisOfPresentationAndGeneralInformationTables Basis of Presentation and General Information (Tables) Tables http://seanergymaritime.com/role/BasisOfPresentationAndGeneralInformation 27 false false R28.htm 080400 - Disclosure - Cash and Cash Equivalents and Restricted Cash (Tables) Sheet http://seanergymaritime.com/role/CashAndCashEquivalentsAndRestrictedCashTables Cash and Cash Equivalents and Restricted Cash (Tables) Tables http://seanergymaritime.com/role/CashAndCashEquivalentsAndRestrictedCash 28 false false R29.htm 080500 - Disclosure - Inventories (Tables) Sheet http://seanergymaritime.com/role/InventoriesTables Inventories (Tables) Tables http://seanergymaritime.com/role/Inventories 29 false false R30.htm 080600 - Disclosure - Vessels, Net (Tables) Sheet http://seanergymaritime.com/role/VesselsNetTables Vessels, Net (Tables) Tables http://seanergymaritime.com/role/VesselsNet 30 false false R31.htm 080700 - Disclosure - Finance Lease, Right-of-use Assets and Finance Lease Liabilities (Tables) Sheet http://seanergymaritime.com/role/FinanceLeaseRightofuseAssetsAndFinanceLeaseLiabilitiesTables Finance Lease, Right-of-use Assets and Finance Lease Liabilities (Tables) Tables http://seanergymaritime.com/role/FinanceLeaseRightofuseAssetsAndFinanceLeaseLiabilities 31 false false R32.htm 080800 - Disclosure - Long-Term Debt and Other Financial Liabilities (Tables) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesTables Long-Term Debt and Other Financial Liabilities (Tables) Tables http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilities 32 false false R33.htm 080900 - Disclosure - Convertible Notes (Tables) Notes http://seanergymaritime.com/role/ConvertibleNotesTables Convertible Notes (Tables) Tables http://seanergymaritime.com/role/ConvertibleNotes 33 false false R34.htm 081100 - Disclosure - Commitments and Contingencies (Tables) Sheet http://seanergymaritime.com/role/CommitmentsAndContingenciesTables Commitments and Contingencies (Tables) Tables http://seanergymaritime.com/role/CommitmentsAndContingencies 34 false false R35.htm 081200 - Disclosure - Capital Structure (Tables) Sheet http://seanergymaritime.com/role/CapitalStructureTables Capital Structure (Tables) Tables http://seanergymaritime.com/role/CapitalStructure 35 false false R36.htm 081300 - Disclosure - Vessel Revenue and Voyage Expenses (Tables) Sheet http://seanergymaritime.com/role/VesselRevenueAndVoyageExpensesTables Vessel Revenue and Voyage Expenses (Tables) Tables http://seanergymaritime.com/role/VesselRevenueAndVoyageExpenses 36 false false R37.htm 081400 - Disclosure - Interest and Finance Costs (Tables) Sheet http://seanergymaritime.com/role/InterestAndFinanceCostsTables Interest and Finance Costs (Tables) Tables http://seanergymaritime.com/role/InterestAndFinanceCosts 37 false false R38.htm 081500 - Disclosure - Earnings per Share (Tables) Sheet http://seanergymaritime.com/role/EarningsPerShareTables Earnings per Share (Tables) Tables http://seanergymaritime.com/role/EarningsPerShare 38 false false R39.htm 081600 - Disclosure - Equity Incentive Plan (Tables) Sheet http://seanergymaritime.com/role/EquityIncentivePlanTables Equity Incentive Plan (Tables) Tables http://seanergymaritime.com/role/EquityIncentivePlan 39 false false R40.htm 090100 - Disclosure - Basis of Presentation and General Information (Details) Sheet http://seanergymaritime.com/role/BasisOfPresentationAndGeneralInformationDetails Basis of Presentation and General Information (Details) Details http://seanergymaritime.com/role/BasisOfPresentationAndGeneralInformationTables 40 false false R41.htm 090200 - Disclosure - Significant Accounting Policies, Accounts Receivable Trade, Net (Details) Sheet http://seanergymaritime.com/role/SignificantAccountingPoliciesAccountsReceivableTradeNetDetails Significant Accounting Policies, Accounts Receivable Trade, Net (Details) Details 41 false false R42.htm 090202 - Disclosure - Significant Accounting Policies, Insurance Claims (Details) Sheet http://seanergymaritime.com/role/SignificantAccountingPoliciesInsuranceClaimsDetails Significant Accounting Policies, Insurance Claims (Details) Details 42 false false R43.htm 090204 - Disclosure - Significant Accounting Policies, Vessel Depreciation (Details) Sheet http://seanergymaritime.com/role/SignificantAccountingPoliciesVesselDepreciationDetails Significant Accounting Policies, Vessel Depreciation (Details) Details 43 false false R44.htm 090206 - Disclosure - Significant Accounting Policies, Impairment of Long-Lived Assets (Vessels) and Right-of-use asset (finance lease) (Details) Sheet http://seanergymaritime.com/role/SignificantAccountingPoliciesImpairmentOfLonglivedAssetsVesselsAndRightofuseAssetFinanceLeaseDetails Significant Accounting Policies, Impairment of Long-Lived Assets (Vessels) and Right-of-use asset (finance lease) (Details) Details 44 false false R45.htm 090208 - Disclosure - Significant Accounting Policies, Office Lease (Details) Sheet http://seanergymaritime.com/role/SignificantAccountingPoliciesOfficeLeaseDetails Significant Accounting Policies, Office Lease (Details) Details 45 false false R46.htm 090210 - Disclosure - Significant Accounting Policies, Commissions (Details) Sheet http://seanergymaritime.com/role/SignificantAccountingPoliciesCommissionsDetails Significant Accounting Policies, Commissions (Details) Details 46 false false R47.htm 090212 - Disclosure - Significant Accounting Policies, Income Taxes (Details) Sheet http://seanergymaritime.com/role/SignificantAccountingPoliciesIncomeTaxesDetails Significant Accounting Policies, Income Taxes (Details) Details 47 false false R48.htm 090214 - Disclosure - Significant Accounting Policies, Segment Reporting (Details) Sheet http://seanergymaritime.com/role/SignificantAccountingPoliciesSegmentReportingDetails Significant Accounting Policies, Segment Reporting (Details) Details 48 false false R49.htm 090300 - Disclosure - Transactions with Related Parties, Spin-Off of United (Details) Sheet http://seanergymaritime.com/role/TransactionsWithRelatedPartiesSpinoffOfUnitedDetails Transactions with Related Parties, Spin-Off of United (Details) Details 49 false false R50.htm 090302 - Disclosure - Transactions with Related Parties, Management Agreements (Details) Sheet http://seanergymaritime.com/role/TransactionsWithRelatedPartiesManagementAgreementsDetails Transactions with Related Parties, Management Agreements (Details) Details 50 false false R51.htm 090400 - Disclosure - Cash and Cash Equivalents and Restricted Cash (Details) Sheet http://seanergymaritime.com/role/CashAndCashEquivalentsAndRestrictedCashDetails Cash and Cash Equivalents and Restricted Cash (Details) Details http://seanergymaritime.com/role/CashAndCashEquivalentsAndRestrictedCashTables 51 false false R52.htm 090500 - Disclosure - Inventories (Details) Sheet http://seanergymaritime.com/role/InventoriesDetails Inventories (Details) Details http://seanergymaritime.com/role/InventoriesTables 52 false false R53.htm 090600 - Disclosure - Vessels, Net, Net Book Value (Details) Sheet http://seanergymaritime.com/role/VesselsNetNetBookValueDetails Vessels, Net, Net Book Value (Details) Details 53 false false R54.htm 090602 - Disclosure - Vessels, Net, Acquisitions and Sales (Details) Sheet http://seanergymaritime.com/role/VesselsNetAcquisitionsAndSalesDetails Vessels, Net, Acquisitions and Sales (Details) Details 54 false false R55.htm 090700 - Disclosure - Finance Lease, Right-of-use Assets and Finance Lease Liabilities (Details) Sheet http://seanergymaritime.com/role/FinanceLeaseRightofuseAssetsAndFinanceLeaseLiabilitiesDetails Finance Lease, Right-of-use Assets and Finance Lease Liabilities (Details) Details http://seanergymaritime.com/role/FinanceLeaseRightofuseAssetsAndFinanceLeaseLiabilitiesTables 55 false false R56.htm 090800 - Disclosure - Long-Term Debt and Other Financial Liabilities, Summary of Long-Term Debt (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesSummaryOfLongtermDebtDetails Long-Term Debt and Other Financial Liabilities, Summary of Long-Term Debt (Details) Details 56 false false R57.htm 090802 - Disclosure - Long-Term Debt and Other Financial Liabilities, October 2022 Danish Ship Finance Loan Facility (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesOctober2022DanishShipFinanceLoanFacilityDetails Long-Term Debt and Other Financial Liabilities, October 2022 Danish Ship Finance Loan Facility (Details) Details 57 false false R58.htm 090804 - Disclosure - Long-Term Debt and Other Financial Liabilities, June 2022 Piraeus Bank Loan Facility (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesJune2022PiraeusBankLoanFacilityDetails Long-Term Debt and Other Financial Liabilities, June 2022 Piraeus Bank Loan Facility (Details) Details 58 false false R59.htm 090806 - Disclosure - Long-Term Debt and Other Financial Liabilities, August 2021 Alpha Bank Loan Facility (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesAugust2021AlphaBankLoanFacilityDetails Long-Term Debt and Other Financial Liabilities, August 2021 Alpha Bank Loan Facility (Details) Details 59 false false R60.htm 090808 - Disclosure - Long-Term Debt and Other Financial Liabilities, Sinopac Loan Facility (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesSinopacLoanFacilityDetails Long-Term Debt and Other Financial Liabilities, Sinopac Loan Facility (Details) Details 60 false false R61.htm 090810 - Disclosure - Long-Term Debt and Other Financial Liabilities, June 2022 Alpha Bank Loan Facility (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesJune2022AlphaBankLoanFacilityDetails Long-Term Debt and Other Financial Liabilities, June 2022 Alpha Bank Loan Facility (Details) Details 61 false false R62.htm 090812 - Disclosure - Long-Term Debt and Other Financial Liabilities, December 2022 Alpha Bank Loan Facility (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesDecember2022AlphaBankLoanFacilityDetails Long-Term Debt and Other Financial Liabilities, December 2022 Alpha Bank Loan Facility (Details) Details 62 false false R63.htm 090814 - Disclosure - Long-Term Debt and Other Financial Liabilities, November 2021 Piraeus Bank Loan Facility (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesNovember2021PiraeusBankLoanFacilityDetails Long-Term Debt and Other Financial Liabilities, November 2021 Piraeus Bank Loan Facility (Details) Details 63 false false R64.htm 090824 - Disclosure - Long-Term Debt and Other Financial Liabilities, UniCredit Bank Loan Facility (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesUnicreditBankLoanFacilityDetails Long-Term Debt and Other Financial Liabilities, UniCredit Bank Loan Facility (Details) Details 64 false false R65.htm 090826 - Disclosure - Long-Term Debt and Other Financial Liabilities, February 2019 ATB Loan Facility (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesFebruary2019AtbLoanFacilityDetails Long-Term Debt and Other Financial Liabilities, February 2019 ATB Loan Facility (Details) Details 65 false false R66.htm 090828 - Disclosure - Long-Term Debt and Other Financial Liabilities, July 2020 Entrust Loan Facility (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesJuly2020EntrustLoanFacilityDetails Long-Term Debt and Other Financial Liabilities, July 2020 Entrust Loan Facility (Details) Details 66 false false R67.htm 090832 - Disclosure - Long-Term Debt and Other Financial Liabilities, ABB Loan Facility (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesAbbLoanFacilityDetails Long-Term Debt and Other Financial Liabilities, ABB Loan Facility (Details) Details 67 false false R68.htm 090834 - Disclosure - Long-Term Debt and Other Financial Liabilities, Evahline Sale and Leaseback (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesEvahlineSaleAndLeasebackDetails Long-Term Debt and Other Financial Liabilities, Evahline Sale and Leaseback (Details) Details 68 false false R69.htm 090836 - Disclosure - Long-Term Debt and Other Financial Liabilities, Village Seven Sale and Leaseback (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesVillageSevenSaleAndLeasebackDetails Long-Term Debt and Other Financial Liabilities, Village Seven Sale and Leaseback (Details) Details 69 false false R70.htm 090838 - Disclosure - Long-Term Debt and Other Financial Liabilities, CMBFL Sale and Leaseback (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesCmbflSaleAndLeasebackDetails Long-Term Debt and Other Financial Liabilities, CMBFL Sale and Leaseback (Details) Details 70 false false R71.htm 090840 - Disclosure - Long-Term Debt and Other Financial Liabilities, Chugoku Bank Sale and Leaseback (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesChugokuBankSaleAndLeasebackDetails Long-Term Debt and Other Financial Liabilities, Chugoku Bank Sale and Leaseback (Details) Details 71 false false R72.htm 090842 - Disclosure - Long-Term Debt and Other Financial Liabilities, Flagship Cargill Sale and Leaseback (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesFlagshipCargillSaleAndLeasebackDetails Long-Term Debt and Other Financial Liabilities, Flagship Cargill Sale and Leaseback (Details) Details 72 false false R73.htm 090844 - Disclosure - Long-Term Debt and Other Financial Liabilities, Hanchen Sale and Leaseback (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesHanchenSaleAndLeasebackDetails Long-Term Debt and Other Financial Liabilities, Hanchen Sale and Leaseback (Details) Details 73 false false R74.htm 090846 - Disclosure - Long-Term Debt and Other Financial Liabilities, Championship Cargill Sale and Leaseback (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesChampionshipCargillSaleAndLeasebackDetails Long-Term Debt and Other Financial Liabilities, Championship Cargill Sale and Leaseback (Details) Details 74 false false R75.htm 090848 - Disclosure - Long-Term Debt and Other Financial Liabilities, Collateral (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesCollateralDetails Long-Term Debt and Other Financial Liabilities, Collateral (Details) Details 75 false false R76.htm 090854 - Disclosure - Long-Term Debt and Other Financial Liabilities, Second JDH Loan (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesSecondJdhLoanDetails Long-Term Debt and Other Financial Liabilities, Second JDH Loan (Details) Details 76 false false R77.htm 090858 - Disclosure - Long-Term Debt and Other Financial Liabilities, Annual Principal Payments (Details) Sheet http://seanergymaritime.com/role/LongtermDebtAndOtherFinancialLiabilitiesAnnualPrincipalPaymentsDetails Long-Term Debt and Other Financial Liabilities, Annual Principal Payments (Details) Details 77 false false R78.htm 090900 - Disclosure - Convertible Notes, Summary (Details) Notes http://seanergymaritime.com/role/ConvertibleNotesSummaryDetails Convertible Notes, Summary (Details) Details 78 false false R79.htm 090910 - Disclosure - Convertible Notes, Second JDH Note (Details) Notes http://seanergymaritime.com/role/ConvertibleNotesSecondJdhNoteDetails Convertible Notes, Second JDH Note (Details) Details 79 false false R80.htm 091000 - Disclosure - Financial Instruments (Details) Sheet http://seanergymaritime.com/role/FinancialInstrumentsDetails Financial Instruments (Details) Details http://seanergymaritime.com/role/FinancialInstruments 80 false false R81.htm 091100 - Disclosure - Commitments and Contingencies (Details) Sheet http://seanergymaritime.com/role/CommitmentsAndContingenciesDetails Commitments and Contingencies (Details) Details http://seanergymaritime.com/role/CommitmentsAndContingenciesTables 81 false false R82.htm 091200 - Disclosure - Capital Structure, Preferred Stock (Details) Sheet http://seanergymaritime.com/role/CapitalStructurePreferredStockDetails Capital Structure, Preferred Stock (Details) Details 82 false false R83.htm 091202 - Disclosure - Capital Structure, Common Stock - NASDAQ Notification - Effect of Reverse Stock Split (Details) Sheet http://seanergymaritime.com/role/CapitalStructureCommonStockNasdaqNotificationEffectOfReverseStockSplitDetails Capital Structure, Common Stock - NASDAQ Notification - Effect of Reverse Stock Split (Details) Details 83 false false R84.htm 091204 - Disclosure - Capital Structure, Common Stock - Dividends (Details) Sheet http://seanergymaritime.com/role/CapitalStructureCommonStockDividendsDetails Capital Structure, Common Stock - Dividends (Details) Details 84 false false R85.htm 091206 - Disclosure - Capital Structure, Common Stock - Common Stock Issuances (Details) Sheet http://seanergymaritime.com/role/CapitalStructureCommonStockCommonStockIssuancesDetails Capital Structure, Common Stock - Common Stock Issuances (Details) Details 85 false false R86.htm 091208 - Disclosure - Capital Structure, Common Stock - Buybacks (Details) Sheet http://seanergymaritime.com/role/CapitalStructureCommonStockBuybacksDetails Capital Structure, Common Stock - Buybacks (Details) Details 86 false false R87.htm 091212 - Disclosure - Capital Structure, Warrants (Details) Sheet http://seanergymaritime.com/role/CapitalStructureWarrantsDetails Capital Structure, Warrants (Details) Details 87 false false R88.htm 091300 - Disclosure - Vessel Revenue and Voyage Expenses, Revenue Recognition (Details) Sheet http://seanergymaritime.com/role/VesselRevenueAndVoyageExpensesRevenueRecognitionDetails Vessel Revenue and Voyage Expenses, Revenue Recognition (Details) Details 88 false false R89.htm 091302 - Disclosure - Vessel Revenue and Voyage Expenses, Income Derived from Charters (Details) Sheet http://seanergymaritime.com/role/VesselRevenueAndVoyageExpensesIncomeDerivedFromChartersDetails Vessel Revenue and Voyage Expenses, Income Derived from Charters (Details) Details 89 false false R90.htm 091304 - Disclosure - Vessel Revenue and Voyage Expenses, Net Trade Accounts Receivable Disaggregated by Revenue Source (Details) Sheet http://seanergymaritime.com/role/VesselRevenueAndVoyageExpensesNetTradeAccountsReceivableDisaggregatedByRevenueSourceDetails Vessel Revenue and Voyage Expenses, Net Trade Accounts Receivable Disaggregated by Revenue Source (Details) Details 90 false false R91.htm 091306 - Disclosure - Vessel Revenue and Voyage Expenses, Revenue from Charterers (Details) Sheet http://seanergymaritime.com/role/VesselRevenueAndVoyageExpensesRevenueFromCharterersDetails Vessel Revenue and Voyage Expenses, Revenue from Charterers (Details) Details 91 false false R92.htm 091308 - Disclosure - Vessel Revenue and Voyage Expenses, Voyage Expenses from Spot and Time Charters (Details) Sheet http://seanergymaritime.com/role/VesselRevenueAndVoyageExpensesVoyageExpensesFromSpotAndTimeChartersDetails Vessel Revenue and Voyage Expenses, Voyage Expenses from Spot and Time Charters (Details) Details 92 false false R93.htm 091400 - Disclosure - Interest and Finance Costs (Details) Sheet http://seanergymaritime.com/role/InterestAndFinanceCostsDetails Interest and Finance Costs (Details) Details http://seanergymaritime.com/role/InterestAndFinanceCostsTables 93 false false R94.htm 091500 - Disclosure - Earnings per Share (Details) Sheet http://seanergymaritime.com/role/EarningsPerShareDetails Earnings per Share (Details) Details http://seanergymaritime.com/role/EarningsPerShareTables 94 false false R95.htm 091600 - Disclosure - Equity Incentive Plan (Details) Sheet http://seanergymaritime.com/role/EquityIncentivePlanDetails Equity Incentive Plan (Details) Details http://seanergymaritime.com/role/EquityIncentivePlanTables 95 false false R96.htm 091700 - Disclosure - Subsequent Events (Details) Sheet http://seanergymaritime.com/role/SubsequentEventsDetails Subsequent Events (Details) Details http://seanergymaritime.com/role/SubsequentEvents 96 false false All Reports Book All Reports [ix-0514-Hidden-Fact-Eligible-For-Transform] WARN: 16 fact(s) appearing in ix:hidden were eligible for transformation: dei:CurrentFiscalYearEndDate, ship:AnnualContribution, ship:DebtInstrumentNoticePeriodToPrepayNotes, ship:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsCurrentNet, ship:DemurrageIncome, ship:DespatchExpense, us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight, us-gaap:DeferredFinanceCostsCurrentNet, us-gaap:IncomeTaxExpenseBenefit, us-gaap:StockholdersEquityNoteStockSplitConversionRatio1 - ef20015287_20f.htm 11 ef20015287_20f.htm ship-20231231.xsd ship-20231231_cal.xml ship-20231231_def.xml ship-20231231_lab.xml ship-20231231_pre.xml http://fasb.org/us-gaap/2023 http://xbrl.sec.gov/dei/2023 true true