Stock Options - Schedule of Stock Options Granted (Details) - $ / shares							9 Months Ended
	Mar. 11, 2020	Mar. 15, 2019	Aug. 24, 2018	Jan. 05, 2018	Mar. 24, 2017	Aug. 27, 2015	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Employee Stock Purchase Plan
Shares (in shares)						58,125	238,500	240,000
Forfeited (in shares)						(22,875)	0	0
Outstanding (in shares)						35,250	864,300	635,550	625,800	395,550
Strike price (in dollars per share)						$ 28.02	$ 25.34	$ 28.01
Vesting period (in years)						5 years
Expiration (in years)						10 years
Tranche One
Employee Stock Purchase Plan
Shares (in shares)	119,300	120,900	75,300	18,750	69,375		119,300
Forfeited (in shares)	0	(1,950)	(1,950)	0	(6,750)
Outstanding (in shares)	119,300	118,950	73,350	18,750	62,625
Strike price (in dollars per share)	$ 25.34	$ 28.01	$ 30.67	$ 30.07	$ 29.47
Vesting period (in years)	3 years	3 years	3 years	3 years	3 years
Expiration (in years)	10 years	10 years	10 years	10 years	10 years
Tranche Two
Employee Stock Purchase Plan
Shares (in shares)	119,200	119,100	149,250	18,750	35,625		119,200
Forfeited (in shares)	0	(1,800)	(4,050)	0	0
Outstanding (in shares)	119,200	117,300	145,200	18,750	35,625
Strike price (in dollars per share)	$ 25.34	$ 28.01	$ 30.67	$ 30.07	$ 29.47
Vesting period (in years)	5 years	5 years	5 years	5 years	5 years
Expiration (in years)	10 years	10 years	10 years	10 years	10 years