Can Suica use to Nikko (Yunishigawa)

I want to visit Yunishigawa and cannot find updated information about IC Card that can be used in Nikko area. I have checked hyperdia, there is Tobu line and special train (Yagan). Can i use Suica for this trip? Thank you

Not valid until Yunishigawa-onsen stn.

Suica also valid for PASMO trains and buses.
http://www.pasmo.co.jp/en/pdf/guide02.pdf
http://www.pasmo.co.jp/en/

But Yagan Railway[野岩鉄道] is NOT PASMO group
http://en.wikipedia.org/wiki/Pasmo
so valid until Shin-fujiwara stn as Tobu Railway Tobu Nikko kinugawa line.
http://en.wikipedia.org/wiki/Yagan_Railway
http://en.wikipedia.org/wiki/File:TB_Nikko,_Kinugawa,_Aidu-Kinugawa,_A...

Thank you for your help :)