Earnings Per Share - Earnings Per Share (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 978,000	$ 1,059,000	$ 2,671,000	$ 807,000	$ 591,000	$ 807,000	$ 2,436,000	$ 764,000	$ 5,513,608	$ 4,598,350
Weighted average shares outstanding									3,351,731	3,370,744
Effect of dilutive employee stock options									100,892	171,166
Denominator for dilutive earnings per share									3,452,623	3,541,910
Basic earnings per share	$ 0.29	$ 0.32	$ 0.80	$ 0.24	$ 0.18	$ 0.24	$ 0.72	$ 0.23	$ 1.65	$ 1.36
Dilutive earnings per share	$ 0.29	$ 0.30	$ 0.77	$ 0.24	$ 0.17	$ 0.23	$ 0.67	$ 0.21	$ 1.60	$ 1.30