ἐπὶ σμικρὸν, lit. ‘to a small extent,’ like “ἐπὶ πολύ, ἐπὶ μέγα, ἐπὶ μακρόν”, etc. Cp. Plat. Soph. 254B “κοινωνεῖν..τὰ μὲν ἐπ᾽ ὀλίγον, τὰ δ᾽ ἐπὶ πολλά”. G. Wolff's reading, ἐπὶ σμικρῶν, could mean, ‘in a few words,’ but is less natural here.
φράσαι is almost redundant, as in O.C. 35, 50, 1582.