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Reconciliation of Segment Operating Income (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014
Reconciliation Of Segment Operating Income Details |  |  |  |  |  |  |  |  |  |
Total operating income |  |  |  |  |  |  |  |  | $ 7,347,006 | $ 7,394,461
Interest expense, net |  |  |  |  |  |  |  |  | 565,212 | 473,486
Other expense, net |  |  |  |  |  |  |  |  | 167,397 | 118,250
Consolidated income before taxes |  |  |  |  |  |  |  |  | 6,614,397 | 6,802,725
Net income | $ 440,000 | $ 1,208,000 | $ 2,710,000 | $ 436,000 | $ 689,000 | $ 1,189,000 | $ 2,543,000 | $ 368,000 | $ 4,793,525 | $ 4,789,005

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