Tenant didn't pay up before leaving

[Jeff Wilson]

Hi, I have a tenant who didn't pay the remainder of his bill (about $1,400) before moving out. I have his phone number, SSN, and an address that he said he was moving to. However he does not answer his phone or call me back. I also went to his new place and knocked on the door, but no one answered even though I know someone was in there. My question is should I use a collection agency, go to small claims court, or do nothing about it? Also if you have any other ideas let me know.