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Note 6 - Long-Term Debt (Details) - Summary of Long-term Debt (Parentheticals)
Mar. 31, 2014
Dec. 31, 2013
Wells Fargo Revolving Loans [Member]
   
Debt Instrument [Line Items]    
Wells Fargo revolving loans, interest rate 3.99% 3.99%
American AgCredit Term Loan [Member]
   
Debt Instrument [Line Items]    
American AgCredit term loan, interest rate 5.00% 5.00%