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Note 6 - Investments in Joint Ventures (Tables) | 9 Months Ended
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May 31, 2013
Equity Method Investments and Joint Ventures Disclosure [Text Block] |
Condensed Balance Sheet [Table Text Block] |
|  | At May 31, 2013 |
|  | Total |  |  | EXCOR |  |  | China |  |  | All Other |
Current assets |  | $ | 63,547,204 |  |  | $ | 23,056,084 |  |  | $ | 13,964,465 |  |  | $ | 26,526,655 |
Total assets |  |  | 69,688,319 |  |  |  | 25,425,172 |  |  |  | 13,993,902 |  |  |  | 30,269,245 |
Current liabilities |  |  | 19,288,471 |  |  |  | 3,056,560 |  |  |  | 6,212,433 |  |  |  | 10,019,478 |
Noncurrent liabilities |  |  | 3,358,593 |  |  |  | — |  |  |  | 869,532 |  |  |  | 2,489,061 |
Joint ventures’ equity |  |  | 47,041,255 |  |  |  | 22,368,612 |  |  |  | 6,911,937 |  |  |  | 17,760,706 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 23,320,080 |  |  |  | 11,184,308 |  |  |  | 3,455,969 |  |  |  | 8,679,803 |
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | $ | 20,877,265 |  |  | $ | 11,153,403 |  |  | $ | 3,405,969 |  |  | $ | 6,327,893 |
|  | At August 31, 2012 |
|  | Total |  |  | EXCOR |  |  | NTI ASEAN |  |  | All Other |
Current assets |  | $ | 61,973,725 |  |  | $ | 24,357,139 |  |  | $ | 15,358,967 |  |  | $ | 22,257,619 |
Total assets |  |  | 68,585,974 |  |  |  | 26,620,589 |  |  |  | 15,522,456 |  |  |  | 26,442,929 |
Current liabilities |  |  | 18,686,181 |  |  |  | 4,749,574 |  |  |  | 5,763,857 |  |  |  | 8,172,750 |
Noncurrent liabilities |  |  | 4,700,458 |  |  |  | — |  |  |  | 1,055,965 |  |  |  | 3,644,493 |
Joint ventures’ equity |  |  | 45,199,335 |  |  |  | 21,871,015 |  |  |  | 8,702,634 |  |  |  | 14,625,686 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 21,461,492 |  |  |  | 10,935,509 |  |  | $ | 3,685,404 |  |  |  | 6,840,579 |
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | $ | 19,403,150 |  |  | $ | 10,904,604 |  |  | $ | 3,314,445 |  |  | $ | 5,184,101 |
Condensed Income Statement [Table Text Block] |
|  | Nine Months Ended May 31, 2013 |
|  | Total |  |  | EXCOR |  |  | China |  |  | All Other |
Net sales |  | $ | 82,788,711 |  |  | $ | 26,043,775 |  |  | $ | 10,802,206 |  |  | $ | 45,942,730 |
Gross profit |  |  | 39,447,084 |  |  |  | 13,624,792 |  |  |  | 5,134,820 |  |  |  | 20,687,472 |
Net income |  |  | 7,626,711 |  |  |  | 4,954,595 |  |  |  | 815,664 |  |  |  | 1,856,452 |
Northern Technologies International Corporation’s share of equity in income of joint ventures |  | $ | 3,733,069 |  |  | $ | 2,478,109 |  |  | $ | 407,809 |  |  | $ | 847,151 |
|  | Nine Months Ended May 31, 2012 |
|  | Total |  |  | EXCOR |  |  | NTI ASEAN |  |  | All Other |
Net sales |  | $ | 83,746,872 |  |  | $ | 25,785,840 |  |  | $ | 16,366,258 |  |  | $ | 41,594,775 |
Gross profit |  |  | 40,201,265 |  |  |  | 13,423,067 |  |  |  | 7,183,786 |  |  |  | 19,594,413 |
Net income |  |  | 8,165,791 |  |  |  | 4,830,477 |  |  |  | 1,941,417 |  |  |  | 1,393,897 |
Northern Technologies International Corporation’s share of equity in income of joint ventures |  | $ | 4,405,327 |  |  | $ | 2,396,596 |  |  | $ | 1,076,230 |  |  | $ | 932,501 |

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