Note 10 - Net Income (Loss) Per Common Share - Reconciliation of the Earnings Per Share Computations (Details) - USD ($)	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016
Net income (loss) attributable to NTIC	$ 3,422,126	$ (867,514)
Basic-weighted shares outstanding (in shares)	4,528,611	4,537,504
Weighted shares assumed upon exercise of stock options (in shares)	48,748
Diluted – weighted shares outstanding (in shares)	4,577,359	4,537,504
Basic income (loss) earnings per share: (in dollars per share)	$ 0.76	$ (0.19)
Diluted income (loss) earnings per share: (in dollars per share)	$ 0.75	$ (0.19)