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Note 6 - Investments in Joint Ventures (Tables) | 12 Months Ended
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Aug. 31, 2016
Notes Tables |
Condensed Balance Sheet [Table Text Block] |
|  | As of August 31, 2016
|  | Total |  | EXCOR |  | All Other
Current assets |  | $ | 48,922,924 |  |  | $ | 22,928,810 |  |  | $ | 25,994,114 |
Total assets |  |  | 52,407,026 |  |  |  | 24,733,340 |  |  |  | 27,673,686 |
Current liabilities |  |  | 12,433,700 |  |  |  | 3,485,231 |  |  |  | 8,948,469 |
Noncurrent liabilities |  |  | 100,783 |  |  |  | — |  |  |  | 100,783 |
Joint ventures’ equity |  |  | 39,872,543 |  |  |  | 21,248,109 |  |  |  | 18,624,434 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 19,840,774 |  |  |  | 10,624,056 |  |  |  | 9,216,728 |
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings |  |  | 17,779,912 |  |  | $ | 10,593,151 |  |  | $ | 7,186,761 |
Northern Technologies International Corporation's dividends received from joint ventures |  | $ | 5,503,314 |  |  | $ | 4,364,700 |  |  | $ | 1,165,614 |
|  | As of August 31, 2015
|  | Total |  | EXCOR |  | All Other
Current assets |  | $ | 49,295,116 |  |  | $ | 22,620,323 |  |  | $ | 26,674,793 |
Total assets |  |  | 52,853,938 |  |  |  | 24,606,880 |  |  |  | 28,247,058 |
Current liabilities |  |  | 12,288,383 |  |  |  | 3,360,142 |  |  |  | 8,928,241 |
Noncurrent liabilities |  |  | 1,215,139 |  |  |  | — |  |  |  | 1,215,139 |
Joint ventures’ equity |  |  | 39,350,417 |  |  |  | 21,246,738 |  |  |  | 18,103,679 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 20,544,238 |  |  |  | 11,571,361 |  |  |  | 8,972,877 |
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings |  |  | 18,483,377 |  |  |  | 11,540,456 |  |  |  | 6,942,921 |
Northern Technologies International Corporation's dividends received from joint ventures |  | $ | 2,983,338 |  |  | $ | 2,440,200 |  |  | $ | 543,138 |
Condensed Income Statement [Table Text Block] |
|  | Fiscal Year Ended August 31, 2016
|  | Total |  | EXCOR |  | All Other
Net sales |  | $ | 90,646,833 |  |  | $ | 35,138,214 |  |  | $ | 55,508,619 |
Gross profit |  |  | 40,440,726 |  |  |  | 18,635,421 |  |  |  | 21,805,305 |
Net income |  |  | 9,534,771 |  |  |  | 7,049,462 |  |  |  | 2,485,309 |
Northern Technologies International Corporation’s share of equity in income from joint ventures |  | $ | 4,743,831 |  |  | $ | 3,534,113 |  |  | $ | 1,209,718 |
|  | Fiscal Year Ended August 31, 2015
|  | Total |  | EXCOR |  | All Other
Net sales |  | $ | 99,026,251 |  |  | $ | 36,872,664 |  |  | $ | 62,153,587 |
Gross profit |  |  | 48,397,318 |  |  |  | 19,993,763 |  |  |  | 28,403,555 |
Net income |  |  | 11,849,107 |  |  |  | 8,201,659 |  |  |  | 3,647,448 |
Northern Technologies International Corporation’s share of equity in income from joint ventures |  | $ | 5,936,565 |  |  | $ | 4,091,608 |  |  | $ | 1,844,957 |

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