  Recent observations by Belle and BESIII of charged quarkonium-like resonances
give new stimulus for theoretical investigation of exotic hadrons in general
and heavy tetraquarks in particular. We use QED_2, a confining theory, as a
model for the masses and decays of tetraquarks. Here we discuss the states (Q
Qbar q qbar) and (Q Q qbar qbar) (and its anti-particle), where Q and q are two
fermion flavors with masses M and m, so that M > m. We then discuss decay modes
of these states into (Q Qqbar), (q qbar), (Q qbar), (Qbar q). It turns out that
(Q Qbar q qbar) is stable, while (Q Q qbar qbar) is not.
