The place is probably Krška vas ( Krška vilage).
There are 104 people in Slovenia with last name Butara, so there are all related.
http://www.stat.si/imena_baza_priimki.asp?ime=&priimek=b...=
There is stil Olga Butara living there, so the best thing is to coll her and ask her If you are related.
Phone:
http://www.itis.si/zemljevid/Page_Map.aspx?X=544524&Y=82...

A lot of Butaras are well know oficers and general in the Slovenian army.They ware fridom fighters in partisans and fought against nacism during WW2,
http://sl.wikipedia.org/wiki/Mihael_Butara
They ware also killed in naci Croat concentration camp Jesenovac (from Croat naci colaborators - ustaša).
https://cp15.heritagewebdesign.com/~lituchy/victimlist.php?l...
during war for Slovenian independents in 1991
http://sl.wikipedia.org/wiki/Miha_Butara
http://sl.wikipedia.org/wiki/Janez_Butara
http://www.veterani-ljubljane.si/prejemniki-priznanj-msnz-19...
and know they are again fighting against corrupt and naci guvrement.
http://www.mladina.si/114254/janez-butara-imamo-vojake-in-im...
http://www.facebook.com/permalink.php?story_fbid=10150958481...
http://www.delo.si/tuditi/tvojsvet/pismo-bralca-spostovani-g...

You should be very proud of them ! They are very brave and man of principles.