In one of my stories' worlds, I have a Mediterranean-flavored people called the Heladoans who have a huge penchant for piracy. They're divided into city-states that constantly fight each other, but they also like to prey on foreign merchants and raid coastal settlements. The reason for their piracy-based economy is that the islands on which they live don't have many natural resources, so they often have to take what they want by force.
I wonder what kind of governments would work well for my pirates' city-states? I'm inclined towards some kind of democracy, in part because historical pirate crews were often democratically run, and additionally because it would enhance the Heladoans' Greek flavor.