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Note 6 - Investments in Joint Ventures (Details) - Condensed Balance Sheet of EXCOR and Tianjin Zerust, and All Other Joint Ventures (USD $) | Feb. 28, 2015 | Aug. 31, 2014
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Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | $ 46,802,727 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets | $ 61,491,957 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
Total assets | 50,375,058 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets | 65,466,964 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
Current liabilities | 12,347,251 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities | 17,542,634 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities
Noncurrent liabilities | 1,080,425 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities | 1,929,488 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities
Joint ventures’ equity | 36,947,382 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity | 45,994,842 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
Northern Technologies International Corporation’s share of joint ventures’ equity | 18,377,038 us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets | 22,961,989 us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | 16,252,890 us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees | 20,540,523 us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees
EXCOR [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | 19,669,250 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember | 24,361,157 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember
Total assets | 21,662,648 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember | 26,652,165 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember
Current liabilities | 2,837,566 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember | 3,512,143 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember
Joint ventures’ equity | 18,825,082 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 | 9,412,543 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 | 9,381,638 us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember | 11,539,108 us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_EXCORMember
All Other [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | 27,133,477 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember | 27,356,120 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember
Total assets | 28,712,410 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember | 29,020,996 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember
Current liabilities | 9,509,685 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember | 9,592,111 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember
Noncurrent liabilities | 1,080,425 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember | 1,061,111 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember
Joint ventures’ equity | 18,122,300 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 | 8,964,499 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 | 6,871,252 us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember | 6,807,891 us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_AllOtherMember
Tianjin Zerust [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets |  | 9,774,680 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_TianjinZerustMember
Total assets |  | 9,793,803 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_TianjinZerustMember
Current liabilities |  | 4,438,380 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_TianjinZerustMember
Noncurrent liabilities |  | 868,377 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_TianjinZerustMember
Joint ventures’ equity |  | 4,487,046 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_TianjinZerustMember
Northern Technologies International Corporation’s share of joint ventures’ equity |  | 2,243,524 us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_TianjinZerustMember
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | $ 2,193,524 us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_TianjinZerustMember

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