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Note 5 - Investments in Joint Ventures (Tables) | 6 Months Ended
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Feb. 28, 2014
Equity Method Investments and Joint Ventures [Abstract] |
Condensed Balance Sheet [Table Text Block] |
|  | At February 28, 2014 |
|  | Total |  |  | EXCOR |  |  | China |  |  | All Other |
Current assets |  | $ | 60,798,447 |  |  | $ | 21,138,250 |  |  | $ | 12,498,369 |  |  | $ | 27,161,828 |
Total assets |  |  | 66,244,262 |  |  |  | 23,578,234 |  |  |  | 12,520,341 |  |  |  | 30,145,687 |
Current liabilities |  |  | 17,443,151 |  |  |  | 3,486,865 |  |  |  | 3,860,391 |  |  |  | 10,095,895 |
Noncurrent liabilities |  |  | 2,126,033 |  |  |  | — |  |  |  | 868,005 |  |  |  | 1,258,028 |
Joint ventures’ equity |  |  | 46,675,076 |  |  |  | 20,091,369 |  |  |  | 7,791,945 |  |  |  | 18,791,762 |
Company’s share of joint ventures’ equity |  |  | 22,653,729 |  |  |  | 10,045,687 |  |  |  | 3,895,973 |  |  |  | 8,712,069 |
Company’s share of joint ventures’ undistributed earnings |  | $ | 20,232,259 |  |  | $ | 10,014,782 |  |  | $ | 3,845,973 |  |  | $ | 6,371,504 |
|  | At August 31, 2013 |
|  | Total |  |  | EXCOR |  |  | China |  |  | All Other |
Current assets |  | $ | 63,052,410 |  |  | $ | 25,955,136 |  |  | $ | 11,200,355 |  |  | $ | 25,896,919 |
Total assets |  |  | 68,417,142 |  |  |  | 28,391,787 |  |  |  | 11,226,755 |  |  |  | 28,798,600 |
Current liabilities |  |  | 16,107,597 |  |  |  | 3,572,004 |  |  |  | 3,080,118 |  |  |  | 9,455,475 |
Noncurrent liabilities |  |  | 2,488,057 |  |  |  | — |  |  |  | 871,886 |  |  |  | 1,616,171 |
Joint ventures’ equity |  |  | 49,821,488 |  |  |  | 24,819,783 |  |  |  | 7,274,751 |  |  |  | 17,726,954 |
Company’s share of joint ventures’ equity |  |  | 24,702,981 |  |  |  | 12,409,893 |  |  |  | 3,637,375 |  |  |  | 8,655,713 |
Company’s share of joint ventures’ undistributed earnings |  | $ | 22,281,510 |  |  | $ | 12,378,988 |  |  | $ | 3,587,375 |  |  | $ | 6,315,147 |
Condensed Income Statement [Table Text Block] |
|  | Six Months Ended February 28, 2014 |
|  | Total |  |  | EXCOR |  |  | China |  |  | All Other |
Net sales |  | $ | 58,050,376 |  |  | $ | 18,963,579 |  |  | $ | 8,257,630 |  |  | $ | 30,829,167 |
Gross profit |  |  | 27,600,668 |  |  |  | 10,072,948 |  |  |  | 3,834,419 |  |  |  | 13,693,301 |
Net income |  |  | 5,479,724 |  |  |  | 3,763,017 |  |  |  | 553,963 |  |  |  | 1,162,744 |
Company’s share of equity in income of joint ventures |  | $ | 2,823,199 |  |  | $ | 1,881,705 |  |  | $ | 276,948 |  |  | $ | 664,546 |
|  | Six Months Ended February 28, 2013 |
|  | Total |  |  | EXCOR |  |  | China |  |  | All Other |
Net sales |  | $ | 54,247,135 |  |  | $ | 17,451,153 |  |  | $ | 6,929,260 |  |  | $ | 29,866,722 |
Gross profit |  |  | 25,852,537 |  |  |  | 9,105,579 |  |  |  | 3,290,660 |  |  |  | 13,456,298 |
Net income |  |  | 4,728,680 |  |  |  | 3,260,575 |  |  |  | 524,546 |  |  |  | 943,559 |
Company’s share of equity in income of joint ventures |  | $ | 2,292,734 |  |  | $ | 1,631,125 |  |  | $ | 262,148 |  |  | $ | 399,461 |

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