Taxes on foreign Freelance Work

I work fulltime in the US as a permanent resident (greencard holder) and do occasional freelance design work for 2 companies based in England and Amsterdam. I am no longer considered a tax resident of the UK but receive my income (less than 5K) into my UK bank account and immediately transfer via transferwise to my US account. I don't recieve tax forms from my clients or transferwise. Does this need to be reported and what additional details would i need to include?

 

Thank you!