Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Information (unaudited)- Summary of Quarterly Results of Operations (Detail)

v3.6.0.2
Quarterly Financial Information (unaudited)- Summary of Quarterly Results of Operations (Detail) - USD ($)
3 Months Ended 12 Months Ended
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
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Operating revenues $ 4,920,325 $ 4,469,174 $ 4,244,441 $ 3,682,677 $ 3,408,331 $ 3,083,553 $ 2,783,853 $ 2,625,724 $ 17,316,617 $ 11,901,461 $ 7,184,922
Operating expenses (2,663,809) (2,663,340) (2,650,404) (2,282,477) (1,856,387) (1,915,900) (1,889,182) (1,671,211)      
Other expenses (2,173,481) (1,771,233) (1,478,177) (1,160,208) (1,184,079) (961,258) (924,960) (929,939) (6,583,099) (4,000,236) (1,698,603)
Net income (loss) before income taxes 83,035 34,601 115,860 239,992 $ 367,865 $ 206,395 $ (30,289) $ 24,574 473,488 568,545 (98,631)
Less: net income attributable to non-controlling interests (9,045) (2,718) (8,047) (5,576)         (25,386) 0 0
Net income attributable to the Company $ 73,990 $ 31,883 $ 107,813 $ 234,416         $ 448,102 $ 568,545 $ (125,133)
Basic and diluted earnings (loss) per common share (in dollars per share) $ 0.01 $ 0.00 $ 0.01 $ 0.02 $ 0.04 $ 0.02 $ 0.00 $ 0.01 $ 0.04 $ 0.07 $ (0.02)
Weighted average common shares outstanding - basic and diluted (in shares) 10,024,875 10,018,331 9,992,941 9,992,941 9,282,280 9,060,314 8,439,855 7,753,717 10,007,350 8,639,397 6,852,917