Note 4 - Long-Term Debt - Summary of Long-term Debt (Details) - USD ($)	Dec. 31, 2016	Aug. 05, 2016	Dec. 31, 2015
Long-term debt, gross	$ 6,857,000	$ 26,400,000	$ 40,565,000
Long-term debt, gross	6,857,000	$ 26,400,000	40,565,000
Less current portion			40,565,000
Long-term debt	6,857,000
Wells Fargo Revolving Loans [Member]
Long-term debt, gross			25,868,000
Long-term debt, gross			25,868,000
First Hawaiian Bank Revolving Line of Credit [Member]
Long-term debt, gross	6,857,000
Long-term debt, gross	6,857,000
American Ag Credit Term Loan [Member]
Long-term debt, gross			14,697,000
Long-term debt, gross			$ 14,697,000