DENVER (AP) _ Hallador Energy Co. (HNRG) on Monday reported a second-quarter loss of $23,000, after reporting a profit in the same period a year earlier.

On a per-share basis, the Denver-based company said it had a loss of less than 1 cent.

The coal, oil and gas producer posted revenue of $57.2 million in the period.

Hallador Energy shares have climbed 14 percent since the beginning of the year. In the final minutes of trading on Monday, shares hit $6.97, an increase of 5 percent in the last 12 months.

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