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Note 11 - Segment and Geographic Information - Total Net Sales by Geographic Distribution (Details) - USD ($) | 12 Months Ended
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Aug. 31, 2019 | Aug. 31, 2018
Net sales by segment | $ 55,750,137 | $ 51,424,821
CHINA |  |
Net sales by segment | 13,030,298 | 12,507,039
BRAZIL |  |
Net sales by segment | 3,151,509 | 3,093,697
INDIA |  |
Net sales by segment | 8,109,468 | 3,052,741
Other Countries [Member] |  |
Net sales by segment | 6,898,403 | 7,470,101
UNITED STATES |  |
Net sales by segment | $ 24,560,459 | $ 25,301,243

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