Employee Benefit Plans - Stock Transactions - Stock Option Plans (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Shares
Options Outstanding, beginning shares	614,311
Options granted, shares	101,000	55,000
Options exercised, shares	(5,500)	(20,434)
Options forfeited, shares	0
Options expired, shares	0
Options Outstanding, ending shares	709,811		614,311
Shares Exercisable	436,981
Weighted average exercise price
Weighted average exercise price, Options Outstanding, beginning (in dollars per share)	$ 14.78
Weighted average exercise price, Options granted (in dollars per share)	20.39	$ 20.61
Weighted average exercise price, Options exercised (in dollars per share)	6.23
Weighted average exercise price, Options forfeited (in dollars per share)	0.00
Weighted average exercise price, Options expired (in dollars per share)	0.00
Weighted average exercise price, Options Outstanding, ending (in dollars per share)	15.65		$ 14.78
Weighted average exercise price, Options Exercisable (in dollars per share)	$ 12.55
Weighted average remaining contractual life , Options Outstanding	7 years 1 month 6 days		6 years 10 months 24 days
Weighted average remaining contractual life, Options exercisable	5 years 9 months 18 days
Aggregate intrinsic value: Options Outstanding	$ 926,893		$ 4,783,402
Aggregate intrinsic value, Options exercisable	$ 926,893