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Reconciliation of Segment Operating Income (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011
Notes to Financial Statements |  |  |  |  |  |  |  |  |  |
Total operating income |  |  |  |  |  |  |  |  | $ 5,360,520 | $ 4,284,964
Interest expense, net |  |  |  |  |  |  |  |  | 264,398 | 254,565
Other expense, net |  |  |  |  |  |  |  |  | 99,076 | 4,379
Consolidated income before taxes |  |  |  |  |  |  |  |  | 4,997,046 | 4,026,020
Net income | $ 430,000 | $ 798,000 | $ 2,061,000 | $ 260,000 | $ 266,000 | $ 682,000 | $ 1,743,000 | $ 120,000 | $ 3,549,231 | $ 2,811,193

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