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Note 6 - Investments in Joint Ventures (Details) - Condensed Income Statement of EXCOR and Tianjin Zerust, and All Other Joint Ventures (USD $)	3 Months Ended		6 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014
Condensed Income Statements, Captions [Line Items]
Net sales			$ 52,178,238us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue	$ 58,050,376us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
Gross profit			25,540,546us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss	27,600,668us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss
Net income			6,152,182us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	5,479,724us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
Company’s share of equity in income of joint ventures	1,474,649us-gaap_IncomeLossFromEquityMethodInvestments	1,395,451us-gaap_IncomeLossFromEquityMethodInvestments	3,081,332us-gaap_IncomeLossFromEquityMethodInvestments	2,823,199us-gaap_IncomeLossFromEquityMethodInvestments
EXCOR [Member]
Condensed Income Statements, Captions [Line Items]
Net sales			18,383,653us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember	18,963,579us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember
Gross profit			9,766,973us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember	10,072,948us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember
Net income			3,924,547us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember	3,763,017us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember
Company’s share of equity in income of joint ventures			1,962,047us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember	1,881,705us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember
Tianjin Zerust [Member]
Condensed Income Statements, Captions [Line Items]
Net sales			3,735,457us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_TianjinZerustMember	8,257,630us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_TianjinZerustMember
Gross profit			1,783,673us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_TianjinZerustMember	3,834,419us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_TianjinZerustMember
Net income			265,648us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_TianjinZerustMember	553,963us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_TianjinZerustMember
Company’s share of equity in income of joint ventures			132,824us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_TianjinZerustMember	276,948us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_TianjinZerustMember
All Other [Member]
Condensed Income Statements, Captions [Line Items]
Net sales			30,059,128us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember	30,829,167us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember
Gross profit			13,989,900us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember	13,693,301us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember
Net income			1,961,987us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember	1,162,744us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember
Company’s share of equity in income of joint ventures			$ 986,460us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember	$ 664,546us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember

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