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Earnings per share | 3 Months Ended
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Mar. 31, 2013
Earnings Per Share [Abstract] |
Earnings per share | 11. Earnings per share For the three months ended March 31, 2013 and 2012, there were no adjustments to net income for purposes of calculating basic and diluted net income available to common shareholders. The following is a reconciliation of the weighted average shares used in the basic and diluted net income per common share computations.
|  | Three Months Ended March 31, |
|  | 2013 |  |  | 2012 |
Weighted average common shares-basic |  |  | 19,431,093 |  |  |  | 18,675,694 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Unexercised stock options net of treasury share repurchase |  |  | 260,048 |  |  |  | 440,501 |
Weighted average common shares-diluted |  |  | 19,691,141 |  |  |  | 19,116,195 |
Options to purchase shares of common stock with exercise prices in excess of the average market price of common shares are not included in the computation of diluted earnings per share. There were 973,037 and 714,686 outstanding options not included in the diluted earnings per share computation for the three months ended March 31, 2013 and 2012, respectively, because the inclusion of these options was anti-dilutive.

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- Definition The entire disclosure for earnings per share. + 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 (a) -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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 + Details
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