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Note 5 - Property and Equipment (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Depreciation, Total $ 306,714 $ 233,241 $ 635,407 $ 456,708
Gain (Loss) on Disposition of Property Plant Equipment, Total $ (81,857) $ (228,431) $ (81,857) $ (228,431)