Note 3 - NTI ASEAN (Details) - Pro Forma Effects of Consolidation of NTI Asean on the Company's Consolidated Financial Statements as of the Beginning of the Period For the Three Months Ended November 30, 2011: (USD $)	3 Months Ended								12 Months Ended
	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2012	May 31, 2012	Feb. 29, 2012	Nov. 30, 2011	Aug. 31, 2013	Aug. 31, 2012
Note 3 - NTI ASEAN (Details) - Pro Forma Effects of Consolidation of NTI Asean on the Company's Consolidated Financial Statements as of the Beginning of the Period For the Three Months Ended November 30, 2011: [Line Items]
Net sales	$ 6,086,734	$ 5,877,033	$ 5,246,350	$ 5,291,747					$ 22,501,864	$ 22,781,653
Cost of goods sold									15,473,212	14,528,785
Gross profit	1,992,771	1,822,669	1,612,437	1,600,775	1,474,594	3,661,390	1,494,246	1,622,638	7,028,652	8,252,868
Joint venture operations									12,590,691	10,142,707
Operating expenses									14,654,367	13,825,806
Operating income									4,964,976	4,569,769
Income before income tax expense	2,294,041	1,445,769	985,155	892,536	416,611	2,454,623	703,991	1,041,421	5,617,501	4,616,646
Income tax expense	332,000	158,000	240,000	134,000	(32,000)	814,000	100,000	106,000	864,000	1,041,000
Net income	1,962,041	1,287,769	745,155	758,536	448,611	1,640,623	603,991	935,421	4,753,501	3,575,646
Net income attributable to non-controlling interest	346,291	360,657	310,745	368,914					1,386,607	127,450
Net income attributable to NTIC	1,615,750	927,112	434,410	389,622					3,366,894	3,448,196
Net income per common diluted share (in Dollars per share)	$ 0.36	$ 0.21	$ 0.10	$ 0.09	$ 0.10	$ 0.33	$ 0.14	$ 0.22	$ 0.75	$ 0.78
As Reported [Member]
Note 3 - NTI ASEAN (Details) - Pro Forma Effects of Consolidation of NTI Asean on the Company's Consolidated Financial Statements as of the Beginning of the Period For the Three Months Ended November 30, 2011: [Line Items]
Net sales										22,781,653
Cost of goods sold										14,528,785
Gross profit										8,252,868
Joint venture operations										10,142,707
Operating expenses										13,825,806
Operating income										4,569,769
Income before income tax expense										4,616,646
Income tax expense										1,041,000
Net income										3,575,646
Net income attributable to non-controlling interest										127,450
Net income attributable to NTIC										3,448,196
Net income per common diluted share (in Dollars per share)										$ 0.78
NTI ASEAN [Member]
Note 3 - NTI ASEAN (Details) - Pro Forma Effects of Consolidation of NTI Asean on the Company's Consolidated Financial Statements as of the Beginning of the Period For the Three Months Ended November 30, 2011: [Line Items]
Joint venture operations										3,395,354
Operating expenses										185,700
Operating income										3,209,654
Income before income tax expense										3,209,654
Income tax expense										381,466
Net income										2,828,188
Net income attributable to non-controlling interest										(1,131,275)
Net income attributable to NTIC										1,696,913
Net income per common diluted share (in Dollars per share)										$ 0.38
Eliminated in Consolidation [Member]
Note 3 - NTI ASEAN (Details) - Pro Forma Effects of Consolidation of NTI Asean on the Company's Consolidated Financial Statements as of the Beginning of the Period For the Three Months Ended November 30, 2011: [Line Items]
Joint venture operations										(1,414,248)
Operating income										(1,414,248)
Income before income tax expense										(1,414,248)
Net income										(1,414,248)
Net income attributable to NTIC										(1,414,248)
Net income per common diluted share (in Dollars per share)										$ (0.32)
Pro Forma [Member]
Note 3 - NTI ASEAN (Details) - Pro Forma Effects of Consolidation of NTI Asean on the Company's Consolidated Financial Statements as of the Beginning of the Period For the Three Months Ended November 30, 2011: [Line Items]
Net sales										22,781,653
Cost of goods sold										14,528,785
Gross profit										8,252,868
Joint venture operations										12,123,813
Operating expenses										14,011,506
Operating income										6,365,175
Income before income tax expense										6,412,052
Income tax expense										1,422,466
Net income										4,989,586
Net income attributable to non-controlling interest										(1,003,825)
Net income attributable to NTIC										$ 3,730,861
Net income per common diluted share (in Dollars per share)										$ 0.84