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Quarterly Financial Information - Summary of Quarterly Results of Operations (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
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 | Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 3,408,331 | $ 3,083,553 | $ 2,783,853 | $ 2,625,724 | $ 2,345,676 | $ 1,777,675 | $ 1,565,935 | $ 1,495,636 | $ 11,901,461 | $ 7,184,922 | $ 4,038,138
Operating expenses | (1,856,387) | (1,915,900) | (1,889,182) | (1,671,211) | (1,799,948) | (1,476,092) | (1,208,458) | (1,100,452) |  |  |
Other expenses | (1,184,079) | (961,258) | (924,960) | (929,939) | (484,661) | (194,351) | (651,948) | (367,643) | (4,000,236) | (1,698,603) | (1,062,406)
Net income (loss) before income taxes | 367,865 | 206,395 | (30,289) | 24,574 | 61,067 | 107,232 | (294,471) | 27,541 | 568,545 | (98,631) | 295,047
Provision for income taxes |  |  |  |  | (6,399) | (6,857) | (6,623) | (6,623) |  | (26,502) | (1,519,730)
Net income (loss) | $ 367,865 | $ 206,395 | $ (30,289) | $ 24,574 | $ 54,668 | $ 100,375 | $ (301,094) | $ 20,918 | $ 568,545 | $ (125,133) | $ (1,224,683)
Earnings (loss) per weighted average common shares - basic and diluted | $ 0.04 | $ 0.02 |  | $ 0.01 | $ 0.01 | $ 0.02 | $ (0.05) |  | $ 0.07 | $ (0.02) | $ (0.20)
Weighted average common shares outstanding - basic and diluted | 9,282,280 | 9,060,314 | 8,439,855 | 7,753,717 | 7,735,354 | 6,605,264 | 6,530,264 | 6,530,264 | 8,639,397 | 6,852,917 | 6,214,557

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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References No definition available. + Details
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