Shareholders' Equity - Textual (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Equity [Abstract]
Exercise of stock options, common stock issued (in shares)	397,671	123,000
Weighted average exercise price, exercised (in USD per share)	$ 1.59	$ 1.88
Treasury stock (in shares)	12,253,502	12,253,502	12,253,502
Treasury stock, shares held at cost	$ 18,929,915	$ 18,929,915	$ 18,929,915