The decicred was 1/10 of a credit. It was considered mere change. During the reign of the Galactic Empire, Palpatine's face was pictured on the obverse of the decicred, while the reverse side showed the Imperial crest.
A few Star Wars works refer to phrases like "a dime a dozen" and "stop on a dime". The word root "dime" means literally a tenth, suggesting that a dime is analogous to the previously established "decicred," worth a tenth of a credit.