Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 141,113	$ (765,793)	$ (300,190)	$ (888,059)
Other comprehensive income:
Interest rate swaps, before taxes				58,527
Income tax applicable to interest rate swaps				(14,632)
Other comprehensive income, net of taxes				43,895
Total comprehensive income (loss)	$ 141,113	$ (765,793)	$ (300,190)	$ (844,164)