I'm a freelancer, and I have a client who owes me $10k in services completed. Is there a legal option to resolve this issue?

This issue is over writing/editing services I completed for a company in Maryland. I'm located in Oregon, so I'm not sure if this creates a legal barrier for me? We signed a contractor agreement when I first started this relationship, and I received payment the first month. However, I completed work for three more months without getting paid -- they still keep putting me off, saying that it's with their CFO or their outside accounting firm. I notified them I couldn't continue providing my services until the billing was settled up. It's nearly six months later with no result, and I'm not sure if I have any legal options to pursue the money I'm owed. It totals out to $10,000 -- would this be worth the effort of going to small claims? And in my contract, it specifies that I'm required to give 30 days notice of quitting, so I've felt that this year, I've been in a tough spot of being able to pursue other job opps because of the contract in place.