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Note 6 - Investments in Joint Ventures (Details) - Condensed Balance Sheet of EXCOR and NTI ASEAN, and All Other Joint Ventures (USD $) | Nov. 30, 2014 | Aug. 31, 2014
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Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | $ 63,676,926 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets | $ 61,491,957 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
Total assets | 67,341,357 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets | 65,466,964 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
Current liabilities | 18,187,978 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities | 17,542,634 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities
Noncurrent liabilities | 2,497,563 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities | 1,929,488 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities
Joint ventures’ equity | 46,655,816 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity | 45,994,842 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
Northern Technologies International Corporation’s share of joint ventures’ equity | 23,302,301 us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets | 22,961,989 us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | 21,178,153 us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees | 20,540,523 us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees
EXCOR [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | 25,235,772 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember | 24,361,157 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember
Total assets | 27,164,361 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember | 26,652,165 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember
Current liabilities | 3,334,169 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember | 3,512,143 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember
Joint ventures’ equity | 23,830,192 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember | 23,140,022 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember
Northern Technologies International Corporation’s share of joint ventures’ equity | 11,915,098 us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember | 11,570,013 us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | 11,884,193 us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember | 11,539,108 us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember
China [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | 10,271,450 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_ChinaMember | 9,774,680 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_ChinaMember
Total assets | 10,289,207 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_ChinaMember | 9,793,803 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_ChinaMember
Current liabilities | 4,665,093 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_ChinaMember | 4,438,380 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_ChinaMember
Noncurrent liabilities | 868,779 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_ChinaMember | 868,377 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_ChinaMember
Joint ventures’ equity | 4,755,335 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_ChinaMember | 4,487,046 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_ChinaMember
Northern Technologies International Corporation’s share of joint ventures’ equity | 2,377,668 us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_ChinaMember | 2,243,524 us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_ChinaMember
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | 2,327,668 us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_ChinaMember | 2,193,524 us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_ChinaMember
All Other [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | 28,169,704 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember | 27,356,120 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember
Total assets | 29,887,789 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember | 29,020,996 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember
Current liabilities | 10,188,716 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember | 9,592,111 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember
Noncurrent liabilities | 1,628,784 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember | 1,061,111 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember
Joint ventures’ equity | 18,070,289 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember | 18,367,775 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember
Northern Technologies International Corporation’s share of joint ventures’ equity | 9,009,535 us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember | 9,148,452 us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | $ 6,966,292 us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember | $ 6,807,891 us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember

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