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Accounting Policies and Basis of Presentation - Debt (Details) (USD $)
0 Months Ended
Feb. 27, 2015
Mar. 31, 2015
Feb. 27, 2015
Line of Credit Facility [Line Items]      
Outstanding borrowings under credit facility   $ 7,018,000us-gaap_LineOfCredit  
Credit facility, remaining borrowing capacity   47,820,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity  
Average interest rate   2.43%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd  
Revolver borrowings [Member]      
Line of Credit Facility [Line Items]      
Outstanding borrowings under credit facility   14,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Fixed asset sub-line term loan [Member]      
Line of Credit Facility [Line Items]      
Outstanding borrowings under credit facility   7,004,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
 
Second Amended and Restated Credit Agreement [Member]      
Line of Credit Facility [Line Items]      
Debt instrument, term 5 years    
Maximum borrowing capacity 80,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= mgpi_SecondAmendedandRestatedCreditAgreementMember
  80,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= mgpi_SecondAmendedandRestatedCreditAgreementMember
Unamortized loan fees   $ 291,000us-gaap_UnamortizedDebtIssuanceExpense
/ us-gaap_DebtInstrumentAxis
= mgpi_SecondAmendedandRestatedCreditAgreementMember