Statements of Operations and Retained Earnings (Accumulated Deficit) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenues	$ 7,251,566	$ 12,116,004
Costs and expenses:
Operating costs	5,707,139	8,028,358
Sales and marketing	350,781	531,897
General and administrative	693,187	715,620
Depreciation	498,027	518,248
Total costs and expenses	7,249,134	9,794,123
Net operating income before other income (expenses)	2,432	2,321,881
Other (income) expenses
Other income	(5,312)	(5,091)
Interest expense	90,472	110,623
Total other expenses, net	85,160	105,532
Net (loss) income	(82,728)	2,216,349
Retained earnings (accumulated deficit) at beginning of period	4,929,385	(5,391,272)
Retained earnings (accumulated deficit) at end of period	$ 4,846,657	$ (3,174,923)