Computation of Earnings Per Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Basic and diluted earnings per share [Abstract]
Net income	$ 355,700	$ 298,600	$ 997,200	$ 732,300
Weighted average shares outstanding for the period (in shares)	1,416,699	1,566,699	1,482,997	1,566,699
Basic earnings per share (in dollars per share)	$ 0.25	$ 0.19	$ 0.67	$ 0.47
Diluted earnings per share (in dollars per share)	$ 0.25	$ 0.19	$ 0.67	$ 0.47