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Debt Financing Short Term Debt (Details) (AgStar Financial Services, PCA [Member], USD $)
6 Months Ended
Apr. 30, 2015
Oct. 31, 2014
Letter of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Interest Rate at Period End   1.50%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= highwater_AgStarFinancialServicesPCAMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_LetterOfCreditMember
Debt Instrument, Basis Spread on Variable Rate 3.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= highwater_AgStarFinancialServicesPCAMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_LetterOfCreditMember
 
Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 5,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= highwater_AgStarFinancialServicesPCAMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
5,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= highwater_AgStarFinancialServicesPCAMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
Debt Instrument, Basis Spread on Variable Rate 3.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= highwater_AgStarFinancialServicesPCAMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
 
Line of Credit, Current   0us-gaap_LinesOfCreditCurrent
/ us-gaap_CreditFacilityAxis
= highwater_AgStarFinancialServicesPCAMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember