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Reconciliation of Segment Operating Income (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012
Reconciliation Of Segment Operating Income Details |  |  |  |  |  |  |  |  |  |
Total operating income |  |  |  |  |  |  |  |  | $ 5,879,096 | $ 5,360,520
Interest expense, net |  |  |  |  |  |  |  |  | 350,334 | 264,398
Other expense, net |  |  |  |  |  |  |  |  | 34,871 | 99,076
Consolidated income before taxes |  |  |  |  |  |  |  |  | 5,493,891 | 4,997,046
Net income | $ 524,000 | $ 959,000 | $ 2,211,000 | $ 309,000 | $ 430,000 | $ 798,000 | $ 2,061,000 | $ 260,000 | $ 4,002,905 | $ 3,549,231

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