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