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Note 9 - Investment in Marketable Securities - Historical Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Amortized cost $ 4,368,749 $ 5,026,390
Gross unrealized (losses) gains 85,470 (24,668)
Fair value* [1] $ 4,454,219 $ 5,001,722
[1] $643,609 in principal repayments was received during the nine months ended September 30, 2016