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Fair Value Measurements - Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis (Details) - USD ($)
Dec. 31, 2017
Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Preferred stock $ 0 $ 368,000
Estimate of Fair Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Preferred stock 0 368,000
Estimate of Fair Value Measurement | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Preferred stock 0 0
Estimate of Fair Value Measurement | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Preferred stock 0 368,000
Estimate of Fair Value Measurement | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Preferred stock 0 0
Estimate of Fair Value Measurement | Coffee-related Derivative Instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Coffee-related derivative assets 332,000 132,000
Coffee-related derivative liabilities 1,665,000 2,179,000
Price Risk Derivative Instruments Not Designated as Hedging Instruments Asset, at Fair Value 40,000  
Coffee-related derivative liabilities 258,000 190,000
Estimate of Fair Value Measurement | Coffee-related Derivative Instruments | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Coffee-related derivative assets 0 0
Coffee-related derivative liabilities 0  
Price Risk Derivative Instruments Not Designated as Hedging Instruments Asset, at Fair Value 0  
Coffee-related derivative liabilities 0 0
Estimate of Fair Value Measurement | Coffee-related Derivative Instruments | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Coffee-related derivative assets 332,000 132,000
Coffee-related derivative liabilities 1,665,000 2,179,000
Price Risk Derivative Instruments Not Designated as Hedging Instruments Asset, at Fair Value 40,000  
Coffee-related derivative liabilities 258,000 190,000
Estimate of Fair Value Measurement | Coffee-related Derivative Instruments | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Coffee-related derivative assets 0 0
Coffee-related derivative liabilities 0  
Price Risk Derivative Instruments Not Designated as Hedging Instruments Asset, at Fair Value 0  
Coffee-related derivative liabilities $ 0 $ 0