Consolidated Statements of Operations - USD ($)	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016
NET SALES:
Net sales, excluding joint ventures	$ 36,346,645	$ 30,211,660
Net sales, to joint ventures	3,222,478	2,721,905
Total net sales	39,569,123	32,933,565
Cost of goods sold	26,316,511	22,320,156
Gross profit	13,252,612	10,613,409
JOINT VENTURE OPERATIONS:
Equity in income from joint ventures	5,898,908	4,743,831
Fees for services provided to joint ventures	5,452,687	5,137,710
Total joint venture operations	11,351,595	9,881,541
OPERATING EXPENSES:
Selling expenses	9,283,310	6,255,353
General and administrative expenses	7,807,563	8,232,369
Research and development expenses	2,912,393	4,724,596
Total operating expenses	20,003,266	19,212,318
OPERATING INCOME	4,600,941	1,282,632
INTEREST INCOME	43,539	42,115
INTEREST EXPENSE	(20,382)	(13,261)
IMPAIRMENT ON INVESTMENT AT CARRYING VALUE (Note 7)		(1,883,668)
INCOME (LOSS) BEFORE INCOME TAX EXPENSE	4,624,098	(572,182)
INCOME TAX EXPENSE	699,519	626,120
NET INCOME (LOSS)	3,924,579	(1,198,302)
NET INCOME (LOSS) ATTRIBUTABLE TO NON-CONTROLLING INTERESTS	502,453	(330,788)
NET INCOME (LOSS) ATTRIBUTABLE TO NTIC	$ 3,422,126	$ (867,514)
NET INCOME (LOSS) ATTRIBUTABLE TO NTIC PER COMMON SHARE:
Basic (in dollars per share)	$ 0.76	$ (0.19)
Diluted (in dollars per share)	$ 0.75	$ (0.19)
WEIGHTED AVERAGE COMMON SHARES
Basic (in shares)	4,528,611	4,537,504
Diluted (in shares)	4,577,359	4,537,504