NAV rose by US$15.8mln to US$93.6mln, which reflected a US$19.6mln net rise in the portfolio's value compared to the previous year.
On a per share basis, NAV rose to US$1.22 from US$0.40 while there was a net profit of US$11.7mln (2016: US$37.2mln loss).
Cash at the year-end amounted to US$13.2mln.
John Croft, chairman, said significant progress had been made in reshaping the portfolio.
"Overall, I am confident that 2018 will be a year of further progress both with disposals and new investments as we move towards a predominantly income generating portfolio which will allow us to make regular dividend distributions to our shareholders."