Statements of Operations and Accumulated Deficit (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenues	$ 4,276,010	$ 3,886,436	$ 24,049,379	$ 23,811,083
Costs and expenses:
Operating costs	4,754,553	4,486,111	19,034,647	19,588,246
Sales and marketing	560,583	486,939	1,748,326	1,939,527
General and administrative	743,988	725,777	2,190,064	2,398,034
Depreciation	533,527	499,420	1,573,009	1,486,408
Total costs and expenses	6,592,651	6,198,247	24,546,046	25,412,215
Net operating loss before other income (expenses)	(2,316,641)	(2,311,811)	(496,667)	(1,601,132)
Other income (expenses)
Other income	4,332	5,084	131,390	15,659
Interest expense	(139,094)	(94,662)	(369,515)	(269,285)
Total other expenses, net	(134,762)	(89,578)	(238,125)	(253,626)
Net loss	(2,451,403)	(2,401,389)	(734,792)	(1,854,758)
Accumulated (deficit) earnings at beginning of period	(1,029,335)	784,777	(2,745,946)	238,146
Accumulated deficit at end of period	$ (3,480,738)	$ (1,616,612)	$ (3,480,738)	$ (1,616,612)