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Consolidated Balance Sheets (Current Period Unaudited) (USD $)
Nov. 30, 2014
Aug. 31, 2014
CURRENT ASSETS:    
Cash and cash equivalents $ 2,598,739us-gaap_CashAndCashEquivalentsAtCarryingValue $ 2,477,017us-gaap_CashAndCashEquivalentsAtCarryingValue
Available for sale securities 4,024,599us-gaap_AvailableForSaleSecuritiesCurrent 5,519,766us-gaap_AvailableForSaleSecuritiesCurrent
Receivables:    
Trade excluding joint ventures, less allowance for doubtful accounts of $40,000 at November 30, 2014 and August 31, 2014, respectively 3,350,630ntic_TradeReceivablesExcludingJointVenturesNetCurrent 3,596,247ntic_TradeReceivablesExcludingJointVenturesNetCurrent
Trade joint ventures 552,714ntic_TradeReceivablesJointVenturesCurrent 951,286ntic_TradeReceivablesJointVenturesCurrent
Fees for services provided to joint ventures 2,769,231ntic_FeesReceivableForServicesProvidedToJointVenturesCurrent 2,612,899ntic_FeesReceivableForServicesProvidedToJointVenturesCurrent
Income taxes 139,606us-gaap_IncomeTaxesReceivable 762us-gaap_IncomeTaxesReceivable
Inventories 5,640,028us-gaap_InventoryGross 5,961,399us-gaap_InventoryGross
Prepaid expenses 755,454us-gaap_PrepaidExpenseCurrent 411,226us-gaap_PrepaidExpenseCurrent
Deferred income taxes 789,364us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 789,364us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Total current assets 20,620,365us-gaap_AssetsCurrent 22,319,966us-gaap_AssetsCurrent
PROPERTY AND EQUIPMENT, NET 6,803,143us-gaap_PropertyPlantAndEquipmentNet 6,477,987us-gaap_PropertyPlantAndEquipmentNet
OTHER ASSETS:    
Investments in joint ventures 23,302,301us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures 22,961,989us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Deferred income taxes 943,279us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 943,279us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Patents and trademarks, net 1,228,181us-gaap_FiniteLivedIntangibleAssetsNet 1,197,700us-gaap_FiniteLivedIntangibleAssetsNet
Other 150,733us-gaap_OtherAssetsNoncurrent 156,854us-gaap_OtherAssetsNoncurrent
Total other assets 25,624,494us-gaap_AssetsNoncurrent 25,259,822us-gaap_AssetsNoncurrent
Total assets 53,048,002us-gaap_Assets 54,057,775us-gaap_Assets
CURRENT LIABILITIES:    
Accounts payable 2,139,655us-gaap_AccountsPayableCurrent 2,225,029us-gaap_AccountsPayableCurrent
Accrued liabilities:    
Payroll and related benefits 1,032,766us-gaap_EmployeeRelatedLiabilitiesCurrent 1,847,246us-gaap_EmployeeRelatedLiabilitiesCurrent
Deferred joint venture royalties 288,000us-gaap_DeferredRevenueCurrent 288,000us-gaap_DeferredRevenueCurrent
Other 102,614us-gaap_OtherAccruedLiabilitiesCurrent 106,380us-gaap_OtherAccruedLiabilitiesCurrent
Total current liabilities 3,563,035us-gaap_LiabilitiesCurrent 4,466,655us-gaap_LiabilitiesCurrent
COMMITMENTS AND CONTINGENCIES (Note 13)      
EQUITY:    
Preferred stock, no par value; authorized 10,000 shares; none issued and outstanding 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, $0.02 par value per share; authorized 10,000,000 shares; issued and outstanding 4,521,883 and 4,504,552, respectively 90,438us-gaap_CommonStockValue 90,092us-gaap_CommonStockValue
Additional paid-in capital 12,942,167us-gaap_AdditionalPaidInCapitalCommonStock 12,676,546us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 33,741,565us-gaap_RetainedEarningsAccumulatedDeficit 32,733,300us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive (loss) income (951,151)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 253,925us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Stockholders’ equity 45,823,019us-gaap_StockholdersEquity 45,753,863us-gaap_StockholdersEquity
Non-controlling interest 3,661,948us-gaap_MinorityInterest 3,837,257us-gaap_MinorityInterest
Total equity 49,484,967us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 49,591,120us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and equity $ 53,048,002us-gaap_LiabilitiesAndStockholdersEquity $ 54,057,775us-gaap_LiabilitiesAndStockholdersEquity