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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2012
Dilutive shares of consolidated condensed statements of operations | The following summarizes the shares included in the dilutive shares as disclosed in the statements of operations:
|  | Year ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Weighted average number of shares for calculation of basic EPS — Common Stock |  |  | 28,352,864 |  |  |  | 22,605,518 |  |  |  | 21,716,775 |
Stock options under Plans |  |  | 509,599 |  |  |  | 849,104 |  |  |  | 779,472 |
Weighted average number of shares for calculation of diluted EPS — Common Stock |  |  | 28,862,463 |  |  |  | 23,454,622 |  |  |  | 22,496,247 |
Common Stock issuable upon the exercise of certain stock options | The accompanying table represents Common Stock issuable upon the exercise of certain stock options and Series C Convertible Preferred Stock that have been excluded from the diluted earnings calculation because the effect of their inclusion would be anti-dilutive.
|  | Year ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Stock options outstanding for the 1993, 1997, 2006 and 2011 Stock Options Plans |  |  | 149,000 |  |  |  | 84,000 |  |  |  | 155,826 |
Series C Convertible Preferred Stock |  |  | 1,531,891 |  |  |  | 3,714,518 |  |  |  | — |
|  |  | 1,680,891 |  |  |  | 3,798,518 |  |  |  | 155,826 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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