I'm guessing the transaction is a
coinbase transaction paying directly to you. If so, the icon looks like this (a pick depicting mining):
https://github.com/etotheipi/BitcoinArmory/blob/master/img/moneyCoinbase.pngI don't see any reason why you shouldn't be able to open details about the transaction. The only major relevant difference is that you must wait for 120 confirmations to spend it instead of just 6.
The only other icon that can go there (AFAICT) besides the usual in/out icons is this:
https://github.com/etotheipi/BitcoinArmory/blob/master/img/moneySelf.pngThis means that you paid money to yourself.