For the second time interval, gross margins increased from 24.09% to 35.66% (12 months ending 2011-12-31 vs. 12 months ending 2010-12-31).

And for the final time interval, gross margins increased from 35.66% to 36.5% (12 months ending 2012-12-31 vs. 12 months ending 2011-12-31).

Environmental rating: 76.
 

2. Digi International Inc. ( DGII): Operates as a device networking company that develops products and technologies to connect and manage local or remote electronic devices over a network, via the Internet or via satellite.  Market cap at $258.23M, most recent closing price at $9.99.

Gross profit margins increased from 48.98% to 50.51% during the first time interval (12 months ending 2010-09-30 vs. 12 months ending 2009-09-30).

For the second time interval, gross margins increased from 50.51% to 52.21% (12 months ending 2011-09-30 vs. 12 months ending 2010-09-30).

And for the final time interval, gross margins increased from 52.21% to 52.66% (12 months ending 2012-09-30 vs. 12 months ending 2011-09-30).

Environmental rating: 71.
 

3. American Public Education, Inc. ( APEI): Provides online higher education focused primarily on serving the military and public service communities.  Market cap at $667.02M, most recent closing price at $37.80.

Gross profit margins increased from 60.81% to 62% during the first time interval (12 months ending 2010-12-31 vs. 12 months ending 2009-12-31).

For the second time interval, gross margins increased from 62% to 63.43% (12 months ending 2011-12-31 vs. 12 months ending 2010-12-31).

And for the final time interval, gross margins increased from 63.43% to 64.85% (12 months ending 2012-12-31 vs. 12 months ending 2011-12-31).

Environmental rating: 70.
 

4. DineEquity, Inc. ( DIN): Develops, franchises, and operates full-service restaurant chains in the United States and internationally.  Market cap at $1.31B, most recent closing price at $69.00.

Gross profit margins increased from 38.57% to 39.65% during the first time interval (12 months ending 2010-12-31 vs. 12 months ending 2009-12-31).

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