SELECTED STATEMENT OF OPERATIONS DATA (Details 7) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Weighted average number of shares issued and outstanding - used in computation of basic EPS	18,767	18,679	18,467
Add - incremental shares from assumed exercise of options	79	124	146
Weighted average number of shares used in computation of diluted EPS	18,846	18,803	18,613

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References+ Details

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.

+ References+ Details

- 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