Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income (loss)	$ 861,299	$ 411,247	$ (22,144)	$ (356,424)	$ 1,272,546	$ (378,568)
Weighted average common shares outstanding:
Average number of common shares outstanding - basic	9,363,981		9,269,567		9,328,432	9,266,189
Net effect of dilutive unvested restricted stock awards included for treasury stock method	38,498				42,503
Average number of common shares outstanding - diluted	9,402,479		9,269,567		9,370,935	9,266,189
Earnings per common share
Basic	$ 0.09		$ 0.00		$ 0.14	$ (0.04)
Diluted	$ 0.09		$ 0.00		$ 0.14	$ (0.04)