Compositions and reaction mixtures are provided for the detection of small RNA target nucleic acids, preferably miRNA target nucleic acids, wherein the compositions and reaction mixtures provide for sensitive and specific detection of the target nucleic acids. The compositions and reaction mixtures include one or more of a first amplification oligomer that is preferably an extender primer, a target capture oligomer that is preferably at least partially double stranded, a promoter primer/provider, a reverse primer that is preferably a universal primer and a detection probe. The compositions and reaction mixtures are useful for diagnostics, prognostics, monitoring the effectiveness of treatment and/or determining a treatment.