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Note 21 - Quarterly Information (Unaudited)
12 Months Ended
Aug. 31, 2015
Notes to Financial Statements  
Quarterly Financial Information [Text Block]
21. QUARTERLY INFORMATION (UNAUDITED)
 
    Fiscal Quarter Ended
    November 30   February 28   May 31   August 31
Fiscal year 2015:                                
Net sales   $ 7,214,095     $ 6,728,709     $ 8,277,575     $ 8,102,314  
Gross profit     2,407,484       2,070,969       2,682,368       2,605,940  
Income before income tax expense     1,647,780       139,149       1,183,180       195,925  
Income tax expense     183,684       197,614       114,180       153,196  
Net income (loss)     1,464,096       (58,465 )     1,069,000       42,729  
Net income attributable to non-controlling interests     455,831       70,179       163,565       38,214  
Net income (loss) attributable to NTIC     1,008,265       (128,644 )     905,435       4,515  
                                 
Net income (loss) per share:                                
Basic   $ 0.22     $ (0.03 )   $ 0.20     $ 0.00  
Diluted   $ 0.22     $ (0.03 )   $ 0.20     $ 0.00  
                                 
Weighted average common shares assumed outstanding:                                
Basic     4,518,973       4,522,514       4,525,109       4,529,251  
Diluted     4,659,621       4,522,514       4,594,992       4,585,196  
 
    Fiscal Quarter Ended
    November 30   February 28   May 31   August 31
Fiscal year 2014:                                
Net sales   $ 6,309,100     $ 6,219,008     $ 6,920,820     $ 7,377,180  
Gross profit     2,151,069       2,167,175       2,251,498       2,453,213  
Income before income tax expense     1,502,418       1,643,828       1,759,537       1,757,291  
Income tax expense     198,000       259,759       361,280       305,623  
Net income     1,304,418       1,384,069       1,398,257       1,451,668  
Net income attributable to non-controlling interests     445,832       359,025       418,040       209,143  
Net income attributable to NTIC     858,586       1,025,044       980,217       1,242,527  
                                 
Net income per share:                                
Basic   $ 0.19     $ 0.23     $ 0.22     $ 0.28  
Diluted   $ 0.19     $ 0.22     $ 0.21     $ 0.27  
                                 
Weighted average common shares assumed outstanding:                                
Basic     4,434,770       4,434,837       4,461,880       4,487,478  
Diluted     4,552,669       4,579,603       4,590,344       4,592,208