Share-Based Payment Plan (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2018
Non executive directors
Plan disclosures
Shares issued			3,130	2,275
Value of shares available for issuance for compensation related to annual fees					$ 10,000
2016 Plan | Restricted stock
Plan disclosures
Shares issued	0	0	36,046	10,127