Guaranty Federal Bancshares Inc. raised its fourth-quarter loan-loss provision by 42% after getting new data on an impaired loan.

The $682.6 million-asset company said Thursday that it was revising its earnings to add $900,000 to its fourth-quarter provision, which had been $1.55 million. Guaranty said the change would widen its quarterly loss, by 173%, to $360,000. After the revision, 2010 earnings fell 30%, to $1.3 million.

Guaranty, of Springfield, Mo., said it revised results after analyzing the underlying collateral of a commercial loan. After conducting an appraisal of the collateral — a condominium project — Guaranty said it was necessary to account for the expected loss.

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