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Note 7 - Property and Equipment - Property and Equipment, Depreciation Expense (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Depreciation expense $ 139,737 $ 63,666 $ 264,197 $ 121,967