I was laid off and not paid fr the last month's health insurance reimbursement

I was laid off on Sep 19, 09. my former employer still owes me approx $200 for health insurance (this was part of my payroll while I was employed). They have ignored all correspondence from me. What recourse do I have? I still have some equipment belonging to them valuead at approx $800. Since they ignore me, can I add interest till the $200 reaches $800 then just keep the equipment?
The company is based in CA, and I was employed in Colorado.