Share-Based Payment Plans (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Non executive directors
Plan disclosures
Shares issued	0	0	2,275	1,830
Value of shares available for issuance for compensation related to annual fees					$ 10,000
2016 Plan | Restricted stock
Plan disclosures
Shares issued	0	0	10,127	7,039
2017 Plan | Restricted stock
Plan disclosures
Shares issued			0