Mikado was a brand created in the late 70s for La Cordee, a Quebec outdoor equipment store that's still around today. From what I can tell, frames were made in Japan until the early 80s, then Canada/Taiwan until they folded in the early 90s.
The brand existed again under new ownership from the late 90s to sometime in the mid 00s.
They're pretty decent bikes, though I've never seen a Taiwanese one in person.
Mikado ended up as a part of the Procycle group, and became one of the discontinued lines along with Peugeot, Oryx, Quetzal and a few others.