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Note 7 - Condensed Income Statement of EXCOR and Tianjin Zerust, and All Other Joint Ventures (Details) - USD ($) | 12 Months Ended
--- | ---
Aug. 31, 2015 | Aug. 31, 2014 | Aug. 31, 2013
EXCOR [Member] |  |  |
Net sales | $ 36,872,664 | $ 39,944,812 | $ 36,476,544
Gross profit | 19,993,763 | 21,045,091 | 19,470,322
Net income | 8,201,659 | 7,906,693 | 7,009,897
Equity in income from joint ventures | 4,091,608 | 3,950,915 | 3,507,057
Joint Venture in India [Member] |  |  |
Net sales | 7,000,715 |  |
Gross profit | 3,292,243 |  |
Net income | 983,179 |  |
Equity in income from joint ventures | 492,379 |  |
Tianjin Zerust [Member] |  |  |
Net sales |  | 15,920,685 | 15,161,289
Gross profit |  | 7,463,168 | 7,153,395
Net income |  | 1,274,487 | 1,157,995
Equity in income from joint ventures |  | 626,763 | 579,376
Joint Venture in Finland [Member] |  |  |
Net sales | 3,557,252 |  |
Gross profit | 1,858,310 |  |
Net income | 518,900 |  |
Equity in income from joint ventures | 263,749 |  |
All Other [Member] |  |  |
Net sales | 51,595,620 | 62,983,393 | 61,551,235
Gross profit | 23,253,002 | 28,452,659 | 25,434,891
Net income | 2,145,369 | 2,661,158 | 2,482,650
Equity in income from joint ventures | 1,088,829 | 1,342,925 | 1,151,278
Net sales | 99,026,251 | 118,848,890 | 113,189,068
Gross profit | 48,397,318 | 56,960,918 | 52,058,609
Net income | 11,849,107 | 11,842,338 | 10,650,542
Equity in income from joint ventures | $ 5,936,565 | $ 5,920,603 | $ 5,237,711

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