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Note 1 - Interim Financial Information - Schedule of Error Corrections (Details) - USD ($)
 3 Months Ended 9 Months Ended
May 31, 2023
May 31, 2022
May 31, 2023
May 31, 2022
Feb. 28, 2023
Aug. 31, 2022
Feb. 28, 2022
Aug. 31, 2021
Cost of goods sold $ 13,389,873 $ 12,722,833 $ 38,957,272 $ 36,977,620        
Net income 1,236,999 1,210,763 2,390,747 6,228,581        
Trade, excluding joint ventures, less allowance for doubtful accounts of $439,000 as of May 31, 2023 and August 31, 2022 14,171,893   14,171,893     $ 14,136,930    
Gross profit 7,579,853 6,242,088 20,236,045 16,929,353        
Comprehensive income 1,144,771 (343,261) 2,779,315 4,291,788        
Trade, excluding joint ventures     (362,810) (1,348,254)        
Total current assets 38,150,150   38,150,150     40,234,881    
Selling expenses 3,893,152 3,450,308 10,996,303 9,659,457        
Comprehensive income attributable to NTIC 1,334,889 (161,978) 3,219,616 4,765,173        
Accrued liabilities     (409,459) (912,803)        
Total assets 86,173,666   86,173,666     86,193,953    
General and administrative expenses 3,205,645 2,560,487 9,470,433 7,675,622        
Accrued liabilities: Payroll and related benefits 1,835,785   1,835,785     2,297,543    
Research and development expenses 1,282,439 1,102,942 3,680,246 3,557,437        
Total current liabilities 15,350,561   15,350,561     17,065,401    
Total operating expenses 8,381,236 7,113,737 24,146,982 20,892,516        
Retained earnings 50,722,758   50,722,758     50,716,613    
Operating income 1,906,586 1,822,936 3,549,718 3,534,770        
Stockholders’ equity 65,457,430   65,457,430     63,595,262    
Income before income tax expense 1,779,294 1,815,077 3,225,570 7,489,018        
Total equity 68,991,191 68,675,670 68,991,191 68,675,670 $ 68,234,243 67,244,296 $ 69,437,767 $ 65,750,581
Total liabilities and equity 86,173,666   86,173,666     $ 86,193,953    
Net income attributable to NTIC $ 1,059,590 $ 1,000,167 $ 1,973,329 $ 5,676,773        
Basic (in dollars per share) $ 0.11 $ 0.11 $ 0.21 $ 0.62        
Diluted (in dollars per share) $ 0.11 $ 0.11 $ 0.2 $ 0.59        
Previously Reported [Member]                
Cost of goods sold $ 13,280,584   $ 38,747,865          
Net income 1,703,005   3,330,504          
Trade, excluding joint ventures, less allowance for doubtful accounts of $439,000 as of May 31, 2023 and August 31, 2022 15,311,650   15,311,650          
Gross profit 7,689,142   20,445,452          
Comprehensive income 1,610,777   3,719,072          
Trade, excluding joint ventures     (1,502,567)          
Total current assets 39,289,907   39,289,907          
Selling expenses 3,723,165   10,649,316          
Comprehensive income attributable to NTIC 1,800,895   4,159,373          
Accrued liabilities     (209,459)          
Total assets 87,313,423   87,313,423          
General and administrative expenses 3,150,643   9,365,431          
Accrued liabilities: Payroll and related benefits 2,035,785   2,035,785          
Research and development expenses 1,150,711   3,401,885          
Total current liabilities 15,550,561   15,550,561          
Total operating expenses 8,024,519   23,416,632          
Retained earnings 51,662,515   51,662,515          
Operating income 2,372,592   4,489,475          
Stockholders’ equity 66,397,187   66,397,187          
Income before income tax expense 2,245,300   4,165,327          
Total equity 69,930,948   69,930,948          
Total liabilities and equity 87,313,423   87,313,423          
Net income attributable to NTIC $ 1,525,596   $ 2,913,086          
Basic (in dollars per share) $ 0.16   $ 0.31          
Diluted (in dollars per share) $ 0.16   $ 0.3          
Revision of Prior Period, Adjustment [Member]                
Cost of goods sold $ 109,289   $ 209,407          
Net income (466,006)   (939,757)          
Trade, excluding joint ventures, less allowance for doubtful accounts of $439,000 as of May 31, 2023 and August 31, 2022 (1,139,757)   (1,139,757)          
Gross profit (109,289)   (209,407)          
Comprehensive income (466,006)   (939,757)          
Trade, excluding joint ventures     1,139,757          
Total current assets (1,139,757)   (1,139,757)          
Selling expenses 169,987   346,987          
Comprehensive income attributable to NTIC (466,006)   (939,757)          
Accrued liabilities     (200,000)          
Total assets (1,139,757)   (1,139,757)          
General and administrative expenses 55,002   105,002          
Accrued liabilities: Payroll and related benefits (200,000)   (200,000)          
Research and development expenses 131,728   278,361          
Total current liabilities (200,000)   (200,000)          
Total operating expenses 356,717   730,350          
Retained earnings (939,757)   (939,757)          
Operating income (466,006)   (939,757)          
Stockholders’ equity (939,757)   (939,757)          
Income before income tax expense (466,006)   (939,757)          
Total equity (939,757)   (939,757)          
Total liabilities and equity (1,139,757)   (1,139,757)          
Net income attributable to NTIC $ (466,006)   $ (939,757)          
Basic (in dollars per share) $ (0.05)   $ 0.1          
Diluted (in dollars per share) $ (0.05)   $ 0.1