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 calculation:
Net income to common stockholders	$ 410,538	$ 164,988	$ 230,701	$ 40,617
Weighted average number of common shares outstanding - basic	4,468,630	4,511,965	4,477,545	4,511,965
Basic net income per share	$ 0.09	$ 0.04	$ 0.05	$ 0.01
Diluted earnings per share calculation:
Weighted average number of common shares outstanding - diluted	4,468,630	4,511,965	4,477,545	4,511,965
Diluted net income per share	$ 0.09	$ 0.04	$ 0.05	$ 0.01