Three Months Ended

Nine Months Ended

Numerators:

May 31, 2013

May 31, 2012

May 31, 2013

May 31, 2012

Net income attributable to NTIC

$

927,112

$

1,454,037

$

1,751,144

$

3,018,987

Denominator:

Basic – weighted shares outstanding

4,421,379

4,399,290

4,415,452

4,379,175

Weighted shares assumed upon exercise of stock options

47,482

61,754

49,322

65,297

Diluted – weighted shares outstanding

4,468,861

4,461,044

4,464,774

4,448,472

Basic earnings per share:

$

0.21

$

0.33

$

0.40

$

0.69

Diluted earnings per share:

$

0.21

$

0.33

$

0.39

$

0.68