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Condensed Consolidated Statements Of Cash Flows (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash Flows from Operating Activities:    
Net Loss $ (4,501,000)us-gaap_NetIncomeLoss $ (3,217,000)us-gaap_NetIncomeLoss
Adjustments to Reconcile Net Loss to Net Cash Provided by Operating Activities:    
Depreciation 5,727,000us-gaap_Depreciation 6,905,000us-gaap_Depreciation
Amortization of Deferred Charges 4,840,000us-gaap_OtherAmortizationOfDeferredCharges 4,286,000us-gaap_OtherAmortizationOfDeferredCharges
Amortization of Intangible Assets 626,000us-gaap_AmortizationOfIntangibleAssets 1,029,000us-gaap_AmortizationOfIntangibleAssets
Deferred Tax   (905,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Non-Cash Share Based Compensation 2,000us-gaap_ShareBasedCompensation 447,000us-gaap_ShareBasedCompensation
Equity in Net (Income) Loss of Unconsolidated Entities (893,000)us-gaap_IncomeLossFromEquityMethodInvestments 108,000us-gaap_IncomeLossFromEquityMethodInvestments
Loss on Sale of Assets 68,000us-gaap_GainsLossesOnSalesOfAssets  
Loss on Extinguishment of Debt 95,000us-gaap_GainsLossesOnExtinguishmentOfDebt  
Loss on Foreign Currency Exchange 45,000us-gaap_ForeignCurrencyTransactionGainLossUnrealized 84,000us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Loss on Derivatives 2,810,000us-gaap_GainLossOnSaleOfDerivatives 14,000us-gaap_GainLossOnSaleOfDerivatives
Other Reconciling Items, net (838,000)us-gaap_OtherOperatingActivitiesCashFlowStatement (1,387,000)us-gaap_OtherOperatingActivitiesCashFlowStatement
Changes in operating assets and liabilities, net of acquisitions:    
Deferred Drydocking Charges (5,515,000)us-gaap_IncreaseDecreaseInDeferredCharges (1,775,000)us-gaap_IncreaseDecreaseInDeferredCharges
Accounts Receivable (878,000)us-gaap_IncreaseDecreaseInAccountsReceivable 3,620,000us-gaap_IncreaseDecreaseInAccountsReceivable
Inventory and Other Current Assets 3,906,000us-gaap_IncreaseDecreaseInInventories 2,006,000us-gaap_IncreaseDecreaseInInventories
Other Assets   (500,000)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Accounts Payable and Accrued Liabilities (3,839,000)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (2,020,000)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Other Long-Term Liabilities 250,000us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities (1,197,000)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities
Net Cash Provided by Operating Activities 1,905,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 7,498,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash Flows from Investing Activities:    
Purchases of and Capital Improvements to Property and Equipment (3,250,000)us-gaap_PaymentsToAcquireProductiveAssets (5,884,000)us-gaap_PaymentsToAcquireProductiveAssets
Investment in Unconsolidated Entities   (5,814,000)us-gaap_PaymentsToAcquireEquityMethodInvestments
Net Change in Restricted Cash Account 1,003,000us-gaap_IncreaseDecreaseInRestrictedCash 2,499,000us-gaap_IncreaseDecreaseInRestrictedCash
Cash Proceeds from the State of Louisiana 122,000ish_ProceedsFromIncentive  
Cash Proceeds from Sale of Assets 16,355,000us-gaap_ProceedsFromSaleOfProductiveAssets  
Cash Proceeds from Receivable Settlement 3,890,000ish_ProceedsFromReceivableSettlement  
Proceeds from Payments on Note Receivables 670,000us-gaap_PaymentsToFundLongtermLoansToRelatedParties 1,062,000us-gaap_PaymentsToFundLongtermLoansToRelatedParties
Net Cash Provided by (Used In) Investing Activities 18,790,000us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (8,137,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash Flows from Financing Activities:    
Proceeds from Line of Credit 5,000,000us-gaap_ProceedsFromLinesOfCredit 8,000,000us-gaap_ProceedsFromLinesOfCredit
Payments on Line of Credit (2,500,000)us-gaap_RepaymentsOfLinesOfCredit (8,000,000)us-gaap_RepaymentsOfLinesOfCredit
Principal Payments on Long Term Debt (19,384,000)ish_PrincipalPaymentsOnLongTermDebt (4,755,000)ish_PrincipalPaymentsOnLongTermDebt
Additions to Deferred Financing Charges (28,000)us-gaap_PaymentsOfFinancingCosts (62,000)us-gaap_PaymentsOfFinancingCosts
Dividends Paid (3,133,000)us-gaap_PaymentsOfDividendsCommonStock (3,119,000)us-gaap_PaymentsOfDividendsCommonStock
Net Cash Used in Financing Activities (20,045,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (7,936,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net Increase (Decrease) in Cash and Cash Equivalents 650,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (8,575,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Cash Equivalents at Beginning of Period 21,133,000us-gaap_CashAndCashEquivalentsAtCarryingValue 20,010,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and Cash Equivalents at End of Period 21,783,000us-gaap_CashAndCashEquivalentsAtCarryingValue 11,435,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of non-cash investing activities:    
Additions to vessels, property, plant and equipment included in accounts payable and other accrued expenses $ 823,000us-gaap_PropertyPlantAndEquipmentAdditions