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Reconciliation of Segment Operating Income (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation Of Segment Operating Income Details |  |  |  |  |  |  |  |  |  |
Total operating income |  |  |  |  |  |  |  |  | $ 8,442,056 | $ 7,347,006
Interest expense, net |  |  |  |  |  |  |  |  | 868,507 | 565,212
Other expense, net |  |  |  |  |  |  |  |  | 76,846 | 167,397
Consolidated income before taxes |  |  |  |  |  |  |  |  | 7,496,703 | 6,614,397
Net income | $ 545,000 | $ 1,473,000 | $ 3,267,000 | $ 565,000 | $ 440,000 | $ 1,208,000 | $ 2,710,000 | $ 436,000 | $ 5,850,998 | $ 4,793,525

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