The Collaborative International Dictionary of English v.0.48:

Dribblet \Drib"blet\, Driblet \Drib"let\, n. [From Dribble.]
   A small piece or part; a small sum; a small quantity of money
   in making up a sum; as, the money was paid in dribblets.
   [1913 Webster]

         When made up in dribblets, as they could, their best
         securities were at an interest of twelve per cent.
                                                  --Burke.
   [1913 Webster]