  We continue our study of hydrodynamic models of self-organized evolution of
agents with singular interaction kernel $\phi(x) = |x|^{-(1+\alpha)}$.
Following our works \cite{ST2017a,ST2017b} which focused on the range $1\leq
\alpha <2$, and Do et. al. \cite{DKRT2017} which covered the range
$0<\alpha<1$, in this paper we revisit the latter case and give a short(-er)
proof of global in time existence of smooth solutions, together with a full
description of their long time dynamics. Specifically, we prove that starting
from any initial condition in $(\rho_0,u_0) \in H^{2+\alpha}\times H^3$, the
solution approaches exponentially fast to a flocking state solution consisting
of a wave $\bar{\rho}=\rho_\infty(x-t\bar{u}))$ traveling with a constant
velocity determined by the conserved average velocity $\bar{u}$. The
convergence is accompanied by exponential decay of all higher order derivatives
of $u$.
