Earned Value Management (EVM) allows you to find trouble spots so that you can take corrective action. As a project manager you are expected to control four areas of the project: performance, time schedule, cost and scope. Variance analysis can't be used for quallity, but is helpful in tracking the schedule and cost.
The best use of EVM on a small scale project is to go to the most detailed line items that are stable and can be measured by physical progress. While this is intensive work for a small project, it enables the project manager a chance to set standard deviations for lesser tasks and on future large scale projects by conducting the research on the smaller project without the typical constraints a larger project has.