Is there a country in the world not in debt? This morning I read the following article: 

https://www.bbc.co.uk/news/business-49961301

It got me thinking, is there any country in the world not in debt? I am aware that debt is good for a country, but to what extent? I am fairly uneducated in this area so please educate me!

Thanks in advance.
According to the World Economic Outlook database (April 2018), in 2018, the "General government net debt" of these countries was negative:


  Kazakhstan, Norway, Trinidad and Tobago, Luxembourg, Botswana, Oman, Estonia.


This database doesn't have this datum for Singapore, but I believe the Singapore government also has negative net debt.