Try Servisair at NWI. Not sure if there is anyone else.
At such a small 'international airport' you will prob do everything, check-in , clean, load, dispatch.
STN not too far away. They have Groundstar, Servisair and Aviance. Gstar have Ryanair and Go contracts so will be looking for staff all year round.
Before you do decide, its good fun but can be bloody hard work unless you like been shafted all day.
Good luck.
BB