Note 6 - Long-Term Debt - Summary of Long-term Debt (Details) (Parentheticals)	Sep. 30, 2015	Dec. 31, 2014
Wells Fargo Revolving Loans [Member]
Revolving loans, interest rate	3.83%	3.82%
American Ag Credit Term Loan [Member]
Revolving loans, interest rate	7.00%	5.00%

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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