Note 19 - Quaterly Information (Unaudited) (Tables)

12 Months Ended

Aug. 31, 2013

Note 19 - Quaterly Information (Unaudited) (Tables) [Line Items]

Schedule of Quarterly Financial Information [Table Text Block]

	Fiscal Quarter Ended
	November 30		February 28		May 31		August 31
Fiscal year 2013:
Net sales	$	5,291,747	$	5,246,350	$	5,877,033	$	6,086,734
Gross profit		1,600,775		1,612,437		1,822,669		1,992,771
Income before income tax expense		892,536		985,155		1,445,769		2,294,041
Income tax expense		134,000		240,000		158,000		332,000
Net income		758,536		745,155		1,287,769		1,962,041
Net income attributable to noncontrolling interest		368,914		310,745		360,657		346,291
Net income attributable to NTIC		389,622		434,410		927,112		1,615,750
Net income per share:
Basic	$	0.09	$	0.10	$	0.21	$	0.37
Diluted	$	0.09	$	0.10	$	0.21	$	0.36
Weighted average common shares assumed outstanding:
Basic		4,406,205		4,418,821		4,421,379		4,431,948
Diluted		4,440,436		4,485,076		4,468,861		4,501,017

Prior Period [Member]

Note 19 - Quaterly Information (Unaudited) (Tables) [Line Items]

Schedule of Quarterly Financial Information [Table Text Block]

	Fiscal Quarter Ended
	November 30		February 29		May 31		August 31
Fiscal year 2012:
Net sales	$	4,832,114	$	4,974,328	$	7,804,904	$	5,170,307
Gross profit		1,622,638		1,494,246		3,661,390		1,474,594
Income before income tax expense		1,041,421		703,991		2,454,623		416,611
Income tax expense (benefit)		106,000		100,000		814,000		(32,000	)
Net income		935,421		603,991		1,640,623		448,611
Net income per share:
Basic	$	0.22	$	0.14	$	0.33	$	0.10
Diluted	$	0.22	$	0.14	$	0.33	$	0.10
Weighted average common shares assumed outstanding:
Basic		4,355,666		4,398,356		4,399,290		4,403,656
Diluted		4,433,724		4,466,435		4,461,044		4,436,444