I would encourage you not to run this through small claims court. If your employer intentionally withheld wages from you and you prevail in court, the employer will get to pay you double what it owes you plus your attorney's fees.
I would suggest you work with an employment law attorney to resolve this. The attorney will likely first write a demand letter, which may clear things up quickly without having to go to court. If that doesn't work, and the case is fairly straight forward, it may be worth pursuing in court, since your former employer will ultimately get to pay your attorney. The only exception to this would be if your former employer is insolvent. A court award is of no use if you can't collect it.
Actually, you can file a complaint with Labor and Industries to recover unpaid wages. L&I will do the work for you on this. Until L&I advises you that the wages cannot be recovered for you by them, it does not appear hiring an attorney or filing a claim in small claims court would be necessary.