  We entertain the possibility that primordialblack holes of mass $\sim
(10^{26}$--$10^{29})$~g, with Schwarzschild radii of $\mathcal{O}{\text{cm}}$,
constitute $\sim 10\%$ or more of cosmic dark matter, as allowed by various
constraints. These black holes would typically originate from cosmological eras
corresponding to temperatures $\mathcal{O}{10-100}$~GeV, and may be associated
with first order phase transitions in the visible or hidden sectors. In case
these small primordial black holes get captured in orbits around neutron stars
or astrophysical black holes in our galactic neighborhood, gravitational waves
from the resulting "David and Goliath (D\&G)" binaries could be detectable at
Advanced LIGO or Advanced Virgo for hours or more, possibly over distances of
$\mathcal{O}{10}$~Mpc encompassing the Local Supercluster of galaxies. The
proposed Einstein Telescope would further expand the reach for these signals. A
positive signal could be further corroborated by the discovery of new particles
in the $\mathcal{O}{10-100}$~GeV mass range, and potentially also the detection
of long wavelength gravitational waves originating from the first order phase
transition era.
