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Note 6 - Investments in Joint Ventures - Condensed Income Statement of EXCOR and All Other Joint Ventures (Details) - USD ($)
 3 Months Ended
Nov. 30, 2017
Nov. 30, 2016
Net sales $ 28,498,711 $ 24,200,447
Gross profit 12,788,122 10,697,027
Net income 3,499,815 2,408,008
Equity in income from joint ventures 1,741,328 1,274,004
EXCOR [Member]    
Net sales 11,026,514 9,208,524
Gross profit 5,933,526 4,894,179
Net income 2,483,800 1,856,338
Equity in income from joint ventures 1,241,900 928,169
Joint Venture in India [Member]    
Net sales 17,472,197 14,991,923
Gross profit 6,854,596 5,802,848
Net income 1,016,015 551,670
Equity in income from joint ventures $ 499,428 $ 345,835