The Yklwa is a simple melee weapon, without any other properties like martial. While you can throw it, it is primarily a melee weapon. It does not have the finesse ability or any other kind of property. This means since it is a melee weapon, the default ability that it uses is the strongest skill. A lot of dungeon masters I know do a little change in the abilities of this weapon, and they make it a martial weapon with the finesse ability. This fixes a lot of issues with the weapon but can make it too powerful for some builts, so you might want to bring down the damage to 1d6 +1 or just 1d6.