Bank Loan (Details) (USD $)	3 Months Ended		6 Months Ended		0 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Feb. 28, 2014	Jun. 30, 2014	Jun. 30, 2013	Dec. 01, 2012	Mar. 18, 2013	Jan. 09, 2012
Line of Credit Facility
Notional amount on interest rate swap transaction								$ 10,000,000
Payments to Acquire Property, Plant, and Equipment			9,399,000	12,128,000
Short-term derivative liabilities	3,720,000		3,720,000			0
Short-term derivative assets	0		0			5,153,000
Net sales	144,809,000	143,129,000	280,793,000	272,658,000
Cost of goods sold	91,667,000	88,755,000	179,530,000	170,279,000
Proceeds from sales of property, plant and equipment			142,000	333,000
Proceeds from stock option exercises			644,000	125,000
Interest Expense	208,000	393,000	415,000	765,000
Income tax expense	252,000	402,000	450,000	709,000
Restricted cash	720,000		720,000			0
Cash and cash equivalents	4,746,000	7,864,000	4,746,000	7,864,000		11,993,000	2,678,000
Short-term investments	23,687,000		23,687,000			22,632,000
(Gains) losses on derivative instruments designated as cash flow hedges reclassified to cost of goods sold	(5,132,000)	3,735,000	(9,842,000)	5,954,000
Gain (Loss) on Sale of Investments	(178,000)	(73,000)	(239,000)	50,000
Net income	2,896,000	4,709,000	5,411,000	6,514,000
Net income per common share—diluted	$ 0.18	$ 0.29	$ 0.33	$ 0.41
Revolving Credit Facility
Line of Credit Facility
Current Borrowing Capacity	75,000,000		75,000,000
Amount borrowed	1,300,000		1,300,000
Remaining borrowing capacity	62,500,000		62,500,000
Debt, Weighted Average Interest Rate	1.91%		1.91%
Letter of Credit
Line of Credit Facility
Amount borrowed	11,200,000		11,200,000
Amendment Number 1 [Member] | Revolving Credit Facility
Line of Credit Facility
Maximum borrowing capacity									75,000,000	85,000,000
Wells Fargo | Amendment Number 1 [Member] | Revolving Credit Facility
Line of Credit Facility
Maximum borrowing capacity									53,000,000
Wells Fargo | New Loan Agreement | Revolving Credit Facility
Line of Credit Facility
Maximum borrowing capacity	75,000,000		75,000,000
Percentage of receivables eligible for advance					85.00%
Percentage of inventory eligible for advance					75.00%
Inventory loan limit					60,000,000
Amendment fee, percentage					0.375%
Unused line fee					0.25%
Line Of Credit Facility, Maximum Periodic Payment Under Covenant	1,750,000					7,000,000
Wells Fargo | New Loan Agreement | Letter of Credit
Line of Credit Facility
Maximum borrowing capacity					20,000,000
JP Morgan Chase | Amendment Number 1 [Member] | Revolving Credit Facility
Line of Credit Facility
Maximum borrowing capacity									22,000,000
Interest Rate Swap [Member]
Line of Credit Facility
Fixed interest rate required to be paid per the swap transaction								0.48%
Net losses from coffee-related derivative instruments	0
Coffee [Member]
Line of Credit Facility
Net losses from coffee-related derivative instruments	(904,000)	(347,000)	(855,000)	(1,195,000)
Coffee [Member] | Interest Rate Swap [Member]
Line of Credit Facility
Net losses on interest rate swap	$ 0	$ (2,000)	$ 0	$ 4,000