Earnings Per Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic and diluted earnings per share calculation:
Net income to common stockholders	$ 464,408	$ 272,049	$ 695,109	$ 312,666
Weighted average number of common shares outstanding - basic	4,468,602	4,511,965	4,474,531	4,511,965
Basic net income per share	$ 0.1	$ 0.06	$ 0.16	$ 0.07
Diluted earnings per share calculation:
Weighted average number of common shares outstanding - diluted	4,475,982	4,511,965	4,482,148	4,511,965
Diluted net income per share	$ 0.1	$ 0.06	$ 0.16	$ 0.07