The dollar fell slightly against the yen early Thursday, after the Bank of Japan left its easy monetary policy unchanged, as widely expected. The decision handily preserved the dollar's attractive rate differential against the yen. But market participants were scrutinizing statements from bank Governor Toshihiko Fukui, trying to learn whether the central bank could tighten policy later in the year. The dollar was down 0.05% at 118.42 yen. The euro last was up 0.1% $1.1977