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Note 19 - Quaterly Information (Unaudited) (Details) - Quarterly Information (Unaudited) (USD $)
 3 Months Ended 12 Months Ended
Aug. 31, 2013
May 31, 2013
Feb. 28, 2013
Nov. 30, 2012
Aug. 31, 2012
May 31, 2012
Feb. 29, 2012
Nov. 30, 2011
Aug. 31, 2013
Aug. 31, 2012
Fiscal year 2013:                    
Net sales $ 6,086,734 $ 5,877,033 $ 5,246,350 $ 5,291,747         $ 22,501,864 $ 22,781,653
Gross profit 1,992,771 1,822,669 1,612,437 1,600,775 1,474,594 3,661,390 1,494,246 1,622,638 7,028,652 8,252,868
Income before income tax expense 2,294,041 1,445,769 985,155 892,536 416,611 2,454,623 703,991 1,041,421 5,617,501 4,616,646
Income tax expense 332,000 158,000 240,000 134,000 (32,000) 814,000 100,000 106,000 864,000 1,041,000
Net income 1,962,041 1,287,769 745,155 758,536 448,611 1,640,623 603,991 935,421 4,753,501 3,575,646
Net income attributable to noncontrolling interest 346,291 360,657 310,745 368,914         1,386,607 127,450
Net income attributable to NTIC $ 1,615,750 $ 927,112 $ 434,410 $ 389,622         $ 3,366,894 $ 3,448,196
Net income per share:                    
Basic (in Dollars per share) $ 0.37 $ 0.21 $ 0.10 $ 0.09 $ 0.10 $ 0.33 $ 0.14 $ 0.22 $ 0.76 $ 0.79
Diluted (in Dollars per share) $ 0.36 $ 0.21 $ 0.10 $ 0.09 $ 0.10 $ 0.33 $ 0.14 $ 0.22 $ 0.75 $ 0.78
Weighted average common shares assumed outstanding:                    
Basic (in Shares) 4,431,948 4,421,379 4,418,821 4,406,205 4,403,656 4,399,290 4,398,356 4,355,666    
Diluted (in Shares) 4,501,017 4,468,861 4,485,076 4,440,436 4,436,444 4,461,044 4,466,435 4,433,724 4,475,895 4,451,594