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Note 11 - Geographic and Segment Information (Details) - Net Sales by Segment (USD $)
 3 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]    
Net sales by segment $ 7,214,095us-gaap_SalesRevenueNet $ 6,309,100us-gaap_SalesRevenueNet
ZERUST [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Net sales by segment 6,238,071us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= ntic_ZERUSTMember		 5,749,013us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= ntic_ZERUSTMember
Natur-Tec [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Net sales by segment $ 976,024us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= ntic_NaturTecMember		 $ 560,087us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= ntic_NaturTecMember