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CONSOLIDATED STATEMENTS OF EARNINGS (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
CONSOLIDATED STATEMENTS OF EARNINGS |  |  |
Revenue | $ 196,317,215 | $ 151,028,582 | $ 108,318,801
Cost and expenses |  |  |
Cost of services | 135,279,937 | 104,022,944 | 85,932,862
Selling, general and administrative | 8,755,270 | 9,626,679 | 6,894,500
Depreciation and amortization expense | 25,502,597 | 19,214,069 | 15,343,804
Total cost and expenses | 169,537,804 | 132,863,692 | 108,171,166
Income from operations | 26,779,411 | 18,164,890 | 147,635
Interest expense | 1,222,454 | 784,425 | 790,417
Income (loss) before income taxes | 25,556,957 | 17,380,465 | (642,782)
Income tax expense: |  |  |
Current | 9,525,543 | 4,077,297 | 433,350
Deferred | 359,535 | 2,469,953 | 146,550
Income tax expense | 9,885,078 | 6,547,250 | 579,900
Net income (loss) | $ 15,671,879 | $ 10,833,215 | $ (1,222,682)
Net income (loss) per common share: |  |  |
Basic (in dollars per share) | $ 0.76 | $ 0.54 | $ (0.06)
Diluted (in dollars per share) | $ 0.75 | $ 0.53 | $ (0.06)
Weighted average number of shares outstanding: |  |  |
Basic (in shares) | 20,489,179 | 20,205,524 | 20,162,944
Diluted (in shares) | 20,855,596 | 20,522,587 | 20,162,944

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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