Earnings Per Share - Earnings Per Share (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 591,000	$ 807,000	$ 2,436,000	$ 764,000	$ (655,000)	$ 1,202,000	$ 2,846,000	$ 659,000	$ 4,598,350	$ 4,052,479
Weighted average shares outstanding									3,370,744	3,356,383
Effect of dilutive employee stock options									171,166	368,220
Denominator for dilutive earnings per share									3,541,910	3,724,603
Basic earnings per share	$ .18	$ .24	$ .72	$ .23	$ (.20)	$ .36	$ .85	$ .20	$ 1.36	$ 1.21
Dilutive earnings per share	$ .19	$ .23	$ .67	$ .21	$ (.16)	$ .32	$ .75	$ .18	$ 1.3	$ 1.09