All countries accept Greek ID cards, so you’ll be perfectly fine.
Slovenia and Croatia are EU countries, and so have to accept it.
Bosnia has accepted EU ID cards since September 2002, and Montenegro since June 2004
According to wikipedia, you should be fine for all eu member states.
Leaving bosnia and montenegro an uncertainty. montenegro seems to accept eu id cards, so does Bosnia
It seems that you can travel with you id only.
Credit:stackoverflow.com‘
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