Consolidated Statements of Operations - USD ($)	12 Months Ended
	Aug. 31, 2019	Aug. 31, 2018
NET SALES:
Net sales, excluding joint ventures	$ 53,142,583	$ 48,516,749
Net sales, to joint ventures	2,607,554	2,908,072
Total net sales	55,750,137	51,424,821
Cost of goods sold	37,970,244	34,165,440
Gross profit	17,779,893	17,259,381
JOINT VENTURE OPERATIONS:
Equity in income from joint ventures	7,225,518	7,527,383
Fees for services provided to joint ventures	5,727,579	6,142,139
Total joint venture operations	12,953,097	13,669,522
OPERATING EXPENSES:
Selling expenses	10,968,592	10,886,011
General and administrative expenses	9,349,559	8,500,490
Research and development expenses	3,822,070	3,524,953
Total operating expenses	24,140,221	22,911,454
OPERATING INCOME	6,592,769	8,017,449
INTEREST INCOME	78,257	99,463
INTEREST EXPENSE	(13,567)	(17,962)
INCOME BEFORE INCOME TAX EXPENSE	6,657,459	8,098,950
INCOME TAX EXPENSE	841,837	876,103
NET INCOME	5,815,622	7,222,847
NET INCOME ATTRIBUTABLE TO NON-CONTROLLING INTERESTS	606,000	521,481
NET INCOME ATTRIBUTABLE TO NTIC	$ 5,209,622	$ 6,701,366
NET INCOME ATTRIBUTABLE TO NTIC PER COMMON SHARE:
Basic (in dollars per share)	$ 0.57	$ 0.74
Diluted (in dollars per share)	$ 0.55	$ 0.72
Basic (in shares)	9,085,584	9,077,676
Diluted (in shares)	9,415,974	9,370,404
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.24	$ 0.20