What is the form for bach little fugue in g minor?

Fughetta in G Minor (BWV 578), sometimes called the Little Fugue in G Minor, is a composition for solo keyboard by Johann Sebastian Bach, written in 1708 while he was organist of the New Church in Arnstadt. It consists of a four-voice fugue in the key of G minor. The fugue is composed of two subjects and counter-subjects that combine in a complex pattern. The exposition is followed by several development sections and a brief coda. The fugue is typically performed on the organ, harpsichord, or piano.