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Note 7 - Investments in Joint Ventures (Tables) | 12 Months Ended
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Aug. 31, 2015
Notes Tables |
Condensed Balance Sheet [Table Text Block] |
|  | August 31, 2015
|  | TOTAL |  | EXCOR |  | India |  | Finland |  | All Other
Current assets |  | $ | 49,295,116 |  |  | $ | 22,620,323 |  |  | $ | 4,035,396 |  |  | $ | 1,415,816 |  |  | $ | 21,223,581 |
Total assets |  |  | 52,853,938 |  |  |  | 24,606,880 |  |  |  | 4,328,196 |  |  |  | 2,197,047 |  |  |  | 21,721,815 |
Current liabilities |  |  | 12,288,383 |  |  |  | 3,360,142 |  |  |  | 1,030,718 |  |  |  | 178,961 |  |  |  | 7,718,562 |
Noncurrent liabilities |  |  | 1,215,139 |  |  |  | — |  |  |  | 155,168 |  |  |  | 433,624 |  |  |  | 626,347 |
Joint ventures’ equity |  |  | 39,350,417 |  |  |  | 21,246,738 |  |  |  | 3,142,310 |  |  |  | 1,584,461 |  |  |  | 13,376,908 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 20,544,238 |  |  |  | 11,571,361 |  |  |  | 1,482,342 |  |  |  | 840,263 |  |  |  | 6,650,272 |
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings |  | $ | 18,483,377 |  |  | $ | 11,540,456 |  |  | $ | 617,520 |  |  | $ | 820,263 |  |  | $ | 5,505,138 |
|  | August 31, 2014
|  | TOTAL |  | EXCOR |  | Tianjin Zerust |  | 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] |
|  | Fiscal Year Ended August 31, 2015
|  | TOTAL |  | EXCOR |  | India |  | Finland |  | All Other
Net sales |  | $ | 99,026,251 |  |  | $ | 36,872,664 |  |  | $ | 7,000,715 |  |  | $ | 3,557,252 |  |  | $ | 51,595,620 |
Gross profit |  |  | 48,397,318 |  |  |  | 19,993,763 |  |  |  | 3,292,243 |  |  |  | 1,858,310 |  |  |  | 23,253,002 |
Net income |  |  | 11,849,107 |  |  |  | 8,201,659 |  |  |  | 983,179 |  |  |  | 518,900 |  |  |  | 2,145,369 |
Northern Technologies International Corporation’s share of equity in income from joint ventures |  | $ | 5,936,565 |  |  | $ | 4,091,608 |  |  | $ | 492,379 |  |  | $ | 263,749 |  |  | $ | 1,088,829 |
|  | Fiscal Year Ended August 31, 2014
|  | TOTAL |  | EXCOR |  | Tianjin Zerust |  | All Other
Net sales |  | $ | 118,848,890 |  |  | $ | 39,944,812 |  |  | $ | 15,920,685 |  |  | $ | 62,983,393 |
Gross profit |  |  | 56,960,918 |  |  |  | 21,045,091 |  |  |  | 7,463,168 |  |  |  | 28,452,659 |
Net income |  |  | 11,842,338 |  |  |  | 7,906,693 |  |  |  | 1,274,487 |  |  |  | 2,661,158 |
Northern Technologies International Corporation’s share of equity in income from joint ventures |  | $ | 5,920,603 |  |  | $ | 3,950,915 |  |  | $ | 626,763 |  |  | $ | 1,342,925 |
|  | Fiscal Year Ended August 31, 2013
|  | TOTAL |  | EXCOR |  | Tianjin Zerust |  | All Other
Net sales |  | $ | 113,189,068 |  |  | $ | 36,476,544 |  |  | $ | 15,161,289 |  |  | $ | 61,551,235 |
Gross profit |  |  | 52,058,609 |  |  |  | 19,470,322 |  |  |  | 7,153,395 |  |  |  | 25,434,891 |
Net income |  |  | 10,650,542 |  |  |  | 7,009,897 |  |  |  | 1,157,995 |  |  |  | 2,482,650 |
Northern Technologies International Corporation’s share of equity in income from joint ventures |  | $ | 5,237,711 |  |  | $ | 3,507,057 |  |  | $ | 579,376 |  |  | $ | 1,151,278 |

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