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Note 6 - Long-Term Debt (Details) - Summary of Long-term Debt (USD $)
Mar. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Long-term debt, gross $ 50,600,000 $ 49,000,000
Less current portion   49,000,000
Long-term debt 50,600,000  
Wells Fargo Revolving Loans [Member]
   
Debt Instrument [Line Items]    
Long-term debt, gross 30,600,000 29,000,000
American AgCredit Term Loan [Member]
   
Debt Instrument [Line Items]    
Long-term debt, gross $ 20,000,000 $ 20,000,000