"Micro-roasted" refers to coffee roasting processes in which the green beans are roasted in small batches to exact specifications so that the roasting can be fine-tuned for the specific bean, from batch to batch.  The process is a craft tended by an artisan rather than a machine.  

Micro-roasted coffee is considered by many to be the best tasting coffee available on the retail market. The processes employed are designed to bring out the best of any coffee variety.