Investments in equity securities (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022		Dec. 31, 2021
Investments in equity securities
Cost Basis		$ 337
Net Unrealized Gains		6
Fair Value		343	[1]	$ 0
Banks and finance
Investments in equity securities
Cost Basis		198
Net Unrealized Gains		1
Fair Value	[1]	199
Consumer products
Investments in equity securities
Cost Basis		29
Net Unrealized Gains		0
Fair Value	[1]	29
Health care
Investments in equity securities
Cost Basis		32
Net Unrealized Gains		2
Fair Value	[1]	34
Industrial
Investments in equity securities
Cost Basis		22
Net Unrealized Gains		1
Fair Value	[1]	23
Information technology
Investments in equity securities
Cost Basis		31
Net Unrealized Gains		2
Fair Value	[1]	33
Utilities and communications
Investments in equity securities
Cost Basis		19
Net Unrealized Gains		0
Fair Value	[1]	19
Other
Investments in equity securities
Cost Basis		6
Net Unrealized Gains		0
Fair Value	[1]	$ 6

[1] The fair value of the Company's equity investments are determined based on readily available market data, and are classified as level 1 fair value measurements.