Computation of Earnings Per Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Basic and diluted earnings per share [Abstract]
Net income/(loss)	$ (81,100)	$ 355,700	$ 236,200	$ 997,200
Weighted average shares outstanding for the period (in shares)	1,416,699	1,416,699	1,416,699	1,482,997
Basic earnings/(loss) per share (in dollars per share)	$ (0.06)	$ 0.25	$ 0.17	$ 0.67
Diluted earnings/(loss) per share (in dollars per share)	$ (0.06)	$ 0.25	$ 0.17	$ 0.67