Consolidated Statements of Operations - USD ($)	12 Months Ended
	Aug. 31, 2018	Aug. 31, 2017
NET SALES:
Net sales, excluding joint ventures	$ 48,516,749	$ 36,346,645
Net sales, to joint ventures	2,908,072	3,222,478
Total net sales	51,424,821	39,569,123
Cost of goods sold	34,165,440	26,316,511
Gross profit	17,259,381	13,252,612
JOINT VENTURE OPERATIONS:
Equity in income from joint ventures	7,527,383	5,898,908
Fees for services provided to joint ventures	6,142,139	5,452,687
Total joint venture operations	13,669,522	11,351,595
OPERATING EXPENSES:
Selling expenses	10,886,011	9,283,310
General and administrative expenses	8,500,490	7,807,563
Research and development expenses	3,524,953	2,912,393
Total operating expenses	22,911,454	20,003,266
OPERATING INCOME	8,017,449	4,600,941
INTEREST INCOME	99,463	43,539
INTEREST EXPENSE	(17,962)	(20,382)
INCOME BEFORE INCOME TAX EXPENSE	8,098,950	4,624,098
INCOME TAX EXPENSE	876,103	699,519
NET INCOME	7,222,847	3,924,579
NET INCOME ATTRIBUTABLE TO NON-CONTROLLING INTERESTS	521,481	502,453
NET INCOME ATTRIBUTABLE TO NTIC	$ 6,701,366	$ 3,422,126
NET INCOME ATTRIBUTABLE TO NTIC PER COMMON SHARE:
Basic (in dollars per share)	$ 1.48	$ 0.76
Diluted (in dollars per share)	$ 1.43	$ 0.75
WEIGHTED AVERAGE COMMON SHARES
Basic (in shares)	4,538,838	4,528,611
Diluted (in shares)	4,685,202	4,577,359
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.40	$ 0