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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