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Note 5 - Long-term Debt (Details) - Summary of Long-term Debt (USD $)	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt, gross	$ 50,176,000us-gaap_LongTermDebt	$ 49,000,000us-gaap_LongTermDebt
Less current portion	2,533,000us-gaap_LongTermDebtCurrent	49,000,000us-gaap_LongTermDebtCurrent
Long-term debt	47,643,000us-gaap_LongTermDebtNoncurrent	0us-gaap_LongTermDebtNoncurrent
Wells Fargo Revolving Loans [Member]
Debt Instrument [Line Items]
Long-term debt, gross	30,643,000	29,000,000
American AgCredit Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 19,533,000	$ 20,000,000

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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