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Note 6 - Investments in Joint Ventures (Tables) | 3 Months Ended
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Nov. 30, 2014
Equity Method Investments and Joint Ventures [Abstract] |
Condensed Balance Sheet [Table Text Block] |
|  | At November 30, 2014 |
|  | Total |  |  | EXCOR |  |  | China |  |  | All Other |
Current assets |  | $ | 63,676,926 |  |  | $ | 25,235,772 |  |  | $ | 10,271,450 |  |  | $ | 28,169,704 |
Total assets |  |  | 67,341,357 |  |  |  | 27,164,361 |  |  |  | 10,289,207 |  |  |  | 29,887,789 |
Current liabilities |  |  | 18,187,978 |  |  |  | 3,334,169 |  |  |  | 4,665,093 |  |  |  | 10,188,716 |
Noncurrent liabilities |  |  | 2,497,563 |  |  |  | — |  |  |  | 868,779 |  |  |  | 1,628,784 |
Joint ventures’ equity |  |  | 46,655,816 |  |  |  | 23,830,192 |  |  |  | 4,755,335 |  |  |  | 18,070,289 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 23,302,301 |  |  |  | 11,915,098 |  |  |  | 2,377,668 |  |  |  | 9,009,535 |
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | $ | 21,178,153 |  |  | $ | 11,884,193 |  |  | $ | 2,327,668 |  |  | $ | 6,966,292 |
|  | At August 31, 2014 |
|  | Total |  |  | EXCOR |  |  | China |  |  | All Other |
Current assets |  | $ | 61,491,957 |  |  | $ | 24,361,157 |  |  | $ | 9,774,680 |  |  | $ | 27,356,120 |
Total assets |  |  | 65,466,964 |  |  |  | 26,652,165 |  |  |  | 9,793,803 |  |  |  | 29,020,996 |
Current liabilities |  |  | 17,542,634 |  |  |  | 3,512,143 |  |  |  | 4,438,380 |  |  |  | 9,592,111 |
Noncurrent liabilities |  |  | 1,929,488 |  |  |  | — |  |  |  | 868,377 |  |  |  | 1,061,111 |
Joint ventures’ equity |  |  | 45,994,842 |  |  |  | 23,140,022 |  |  |  | 4,487,046 |  |  |  | 18,367,775 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 22,961,989 |  |  |  | 11,570,013 |  |  |  | 2,243,524 |  |  |  | 9,148,452 |
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | $ | 20,540,523 |  |  | $ | 11,539,108 |  |  | $ | 2,193,524 |  |  | $ | 6,807,891 |
Condensed Income Statement [Table Text Block] |
|  | Three Months Ended November 30, 2014 |
|  | Total |  |  | EXCOR |  |  | China |  |  | All Other |
Net sales |  | $ | 29,120,852 |  |  | $ | 9,524,270 |  |  | $ | 3,735,457 |  |  | $ | 15,861,125 |
Gross profit |  |  | 14,035,784 |  |  |  | 4,974,751 |  |  |  | 1,783,673 |  |  |  | 7,277,360 |
Net income |  |  | 3,184,570 |  |  |  | 1,956,191 |  |  |  | 265,648 |  |  |  | 962,731 |
Northern Technologies International Corporation’s share of equity in income of joint ventures |  | $ | 1,606,683 |  |  | $ | 978,096 |  |  | $ | 132,824 |  |  | $ | 495,763 |
|  | Three Months Ended November 30, 2013 |
|  | Total |  |  | EXCOR |  |  | China |  |  | All Other |
Net sales |  | $ | 29,661,218 |  |  | $ | 9,476,403 |  |  | $ | 4,294,138 |  |  | $ | 15,890,677 |
Gross profit |  |  | 14,166,070 |  |  |  | 5,063,662 |  |  |  | 2,016,809 |  |  |  | 7,085,599 |
Net income |  |  | 2,837,565 |  |  |  | 1,853,307 |  |  |  | 298,708 |  |  |  | 685,550 |
Northern Technologies International Corporation’s share of equity in income of joint ventures |  | $ | 1,427,748 |  |  | $ | 926,654 |  |  | $ | 149,354 |  |  | $ | 351,740 |

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