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Note 15 - Sale of RHR (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Royal Hawaiian Resources [Member] | General Partner [Member]          
Proceeds from Sale of Interest in Partnership Unit $ 224,000     $ 224,000  
General Partner [Member]          
Proceeds from Sale of Interest in Partnership Unit   224,000
Proceeds from Sale of Interest in Partnership Unit   $ 224,000
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest       1.00%  
Annual Management Fee Entitlement, Percent of Operating Cash Flow       2.00%  
Period Without Incentive Fee Earnings       15 years