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Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended
Nov. 30, 2019
Nov. 30, 2018
NET SALES:    
Net sales, excluding joint ventures $ 14,045,784 $ 13,610,865
Net sales, to joint ventures 585,616 483,187
Total net sales 14,631,400 14,094,052
Cost of goods sold 9,805,084 9,461,137
Gross profit 4,826,316 4,632,915
JOINT VENTURE OPERATIONS:    
Equity in income from joint ventures 1,293,991 2,004,162
Fees for services provided to joint ventures 1,358,325 1,428,435
Total joint venture operations 2,652,315 3,432,597
OPERATING EXPENSES:    
Selling expenses 2,887,292 2,811,094
General and administrative expenses 2,049,687 2,495,797
Research and development expenses 961,641 872,157
Total operating expenses 5,898,620 6,179,048
OPERATING INCOME 1,580,011 1,886,464
INTEREST INCOME 49,038 12,787
INTEREST EXPENSE (5,444) (2,357)
INCOME BEFORE INCOME TAX EXPENSE 1,623,605 1,896,894
INCOME TAX EXPENSE 264,066 255,703
NET INCOME 1,359,539 1,641,191
NET INCOME ATTRIBUTABLE TO NON-CONTROLLING INTERESTS 146,989 144,132
NET INCOME ATTRIBUTABLE TO NTIC $ 1,212,550 $ 1,497,059
NET INCOME ATTRIBUTABLE TO NTIC PER COMMON SHARE:    
Basic (in dollars per share) $ 0.13 $ 0.16
Diluted (in dollars per share) $ 0.13 $ 0.16
WEIGHTED AVERAGE COMMON SHARES ASSUMED OUTSTANDING:    
Basic (in shares) 9,095,607 9,084,350
Diluted (in shares) 9,407,642 9,478,576
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share) $ 0.065 $ 0.06