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Note 10 - Net Income Per Common Share - Reconciliation of the Earnings Per Share Computations (Details) - USD ($)	3 Months Ended		9 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2017	May 31, 2016
Net income attributable to NTIC	$ 1,352,416	$ 917,373	$ 2,037,021	$ 575,233
Basic – weighted shares outstanding (in shares)	4,526,771	4,538,970	4,528,523	4,538,005
Weighted shares assumed upon exercise of stock options (in shares)	64,756	24,831	42,872	49,059
Diluted – weighted shares outstanding (in shares)	4,591,527	4,563,801	4,571,395	4,587,064
Basic income per share: (in dollars per share)	$ 0.30	$ 0.20	$ 0.45	$ 0.13
Diluted income per share: (in dollars per share)	$ 0.30	$ 0.20	$ 0.45	$ 0.13

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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