Net Income per Common Share (Details)	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Schedule of reconciliation of basic and diluted weighted average common shares outstanding
Weighted average common shares outstanding - basic	15,199,802	14,846,249	15,109,311	14,742,855
Dilutive common shares issuable in connection with stock plans	154,657	177,331	190,807	228,812
Weighted average common shares outstanding - diluted	15,354,459	15,023,580	15,300,118	14,971,667

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

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+ Details