The word gets decent search volume (18,100 exacts), but, if you look at the suggested words on GAKT they all revolve around 'definition of' 'meaning' etc.. In other words people are searching for bucolic because they have come across the word and don't know what it means.
A google seacrch (for me) returns results for dictionaries etc.. with no paid ads.
It looks like there is a Spanish hotel group using bucolic.es with names like bucolichoteles.com forwarding to the .es domain.
They may want your dictionary word. Make sure that your parked page doesn't display any hotel ads.
I'd suggest pricing it at low xxx and dropping it if you can't find a buyer before renewal time. It isn't worth carrying the renewal fees for these type of dictionary words in the .net extension.