Note 9 - Net Income Per Common Share - Reconciliation of the Earnings Per Share Computations (Details) - USD ($)	3 Months Ended
	Nov. 30, 2017	Nov. 30, 2016
Net income attributable to NTIC	$ 1,083,626	$ 297,639
Basic – weighted shares outstanding (in shares)	4,537,368	4,531,950
Weighted shares assumed upon exercise of stock options (in shares)	71,420	26,928
Diluted – weighted shares outstanding (in shares)	4,608,788	4,558,878
Basic earnings per share: (in dollars per share)	$ 0.24	$ 0.07
Diluted earnings per share: (in dollars per share)	$ 0.24	$ 0.07