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Note 6 - Property and Equipment - Property and Equipment (Details) - USD ($)
Sep. 30, 2017
Sep. 30, 2016
Property and equipment $ 2,163,797 $ 2,006,423
Accumulated depreciation (1,654,194) (1,533,079)
Property and equipment, net 509,603 473,344
Machinery and Equipment [Member]    
Property and equipment 994,157 957,829
Furniture and Fixtures [Member]    
Property and equipment 1,093,502 976,856
Leasehold Improvements [Member]    
Property and equipment $ 76,138 $ 71,738