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Income taxes (Details) - USD ($)	3 Months Ended		6 Months Ended
Income taxes (Details) - USD ($)	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Income Tax Disclosure [Line Items]
U.S. statutory tax rate (percentage)			21.00%
Deferred tax assets, valuation allowance	$ 1,500,000		$ 1,500,000		$ 1,300,000
Net deferred tax assets after valuation allowance	400,000		400,000		0
Income tax (benefit) expense	(402,000)	$ 20,000	(402,000)	$ 20,000
Income tax expense (benefit) related to available for sale securities	400,000	$ 0	400,000	$ 0
Unrecognized tax benefits	$ 0		$ 0		$ 0
GIBRALTAR
Income Tax Disclosure [Line Items]
Statutory tax rate (percentage)			10.00%
ROMANIA
Income Tax Disclosure [Line Items]
Statutory tax rate (percentage)			16.00%