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

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