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Note 17 - Reconciliations of the Expected Federal Income Tax at the Statutory Rate with the Provisions For Income Taxes (Details) - USD ($)
 12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Tax computed at statutory rates $ 1,076,000 $ 2,265,000 $ 1,910,000
State income tax, net of federal benefit (32,000) 13,000 15,000
Tax effect on equity in (income) loss of international joint ventures (1,986,000) (2,055,000) (1,781,000)
Tax effect on dividends received from joint ventures 1,470,000 3,285,000 1,732,000
Tax effect of foreign operations 996,000 1,131,000 807,000
Foreign tax credit (1,937,000) (3,710,000) (2,524,000)
Research and development credit (314,000) (88,000) (364,000)
Valuation allowance $ 1,379,000 $ 687,000 1,635,000
Tax-exempt income $ (230,000)
Stock based compensation $ 99,000
Non-controlling interest in partnership income (204,000) $ (440,000) $ (425,000)
Other 102,000 36,000 89,000
$ 648,674 $ 1,124,662 $ 864,000