I have one that's tiny like yours, too, and it hasn't grown in 3 yrs :)
Hi there, I think the inhomogeneous just means its not uniform throughout. I have Hashis, and my scans came up heterogeneous. Since the Hashi's was attacking my thyroid, it showed scarring or a heterogeneous( many structural changes ) look.
The percent of cancer nodules to benign is very small. You nodule is very small also, which is good. Usually they will wait to see if the nodule gets bigger. From there, they will do an FNA(fine needle aspiration) to sample the tissue and any fluid inside the nodule. Mine was 6mm and they still were able to do the FNA, so you might want to look into that, or see what their game plan is for you.
At this point, I couldn't tell you if it was cancer or not. I had a small nodule on my left lobe that they did a FNA(fine needle aspiration) sample and found the tissue and fluid to be "suspicious" from there, the doctor decided to go in and remove. The rest is history, I ended up just having my left lobe out since the nodule was contained and my right lobe looked good.
Sorry I couldn't be more help, but hopefully this gave you a little insight.