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Note 4 - Property and Equipment (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Depreciation, Depletion and Amortization $ 854,063 $ 763,736 $ 704,435
Property, Plant and Equipment, Additions $ 247,881 $ 67,283