Computation of Earnings Per Share (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Basic and diluted earnings per share [Abstract]
Net income	$ 317,300	$ 641,500
Weighted average shares outstanding for the period (in shares)	1,416,699	1,550,032
Basic earnings per share (in dollars per share)	$ 0.22	$ 0.41
Diluted earnings per share (in dollars per share)	$ 0.22	$ 0.41