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Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 28, 2018
Feb. 28, 2017
NET SALES:        
Net sales, excluding joint ventures $ 11,399,853 $ 8,309,586 $ 22,435,260 $ 17,191,551
Net sales, to joint ventures 814,122 433,317 1,321,753 1,253,375
Total net sales 12,213,975 8,742,903 23,757,013 18,444,926
Cost of goods sold 8,012,836 5,870,186 15,901,306 12,482,952
Gross profit 4,201,139 2,872,717 7,855,707 5,961,974
JOINT VENTURE OPERATIONS:        
Equity in income from joint ventures 1,805,997 1,383,139 3,547,325 2,657,143
Fees for services provided to joint ventures 1,608,890 1,184,028 3,116,032 2,499,619
Total joint venture operations 3,414,887 2,567,167 6,663,357 5,156,762
OPERATING EXPENSES:        
Selling expenses 2,643,636 2,246,482 5,243,585 4,285,566
General and administrative expenses 1,805,216 1,842,528 4,024,961 4,314,308
Research and development expenses 922,746 742,037 1,721,477 1,384,559
Total operating expenses 5,371,598 4,831,047 10,990,023 9,984,433
OPERATING INCOME 2,244,428 608,837 3,529,041 1,134,303
INTEREST INCOME 24,883 4,516 48,939 8,079
INTEREST EXPENSE (5,779) (3,470) (10,868) (8,093)
INCOME BEFORE INCOME TAX EXPENSE 2,263,532 609,883 3,567,112 1,134,289
INCOME TAX EXPENSE 841,909 124,909 946,900 242,622
NET INCOME 1,421,623 484,974 2,620,212 891,667
NET INCOME ATTRIBUTABLE TO NON-CONTROLLING INTERESTS 88,776 98,008 203,739 207,062
NET INCOME ATTRIBUTABLE TO NTIC $ 1,332,847 $ 386,966 $ 2,416,473 $ 684,605
NET INCOME ATTRIBUTABLE TO NTIC PER COMMON SHARE:        
Basic (in dollars per share) $ 0.29 $ 0.09 $ 0.53 $ 0.15
Diluted (in dollars per share) $ 0.29 $ 0.09 $ 0.52 $ 0.15
WEIGHTED AVERAGE COMMON SHARES ASSUMED OUTSTANDING:        
Basic (in shares) 4,537,408 4,525,091 4,537,368 4,527,555
Diluted (in shares) 4,673,338 4,562,024 4,641,042 4,559,485
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share) $ 0.10 $ 0 $ 0.20 $ 0