Accounts Receivable

6 Months Ended

Jun. 30, 2011

ACCOUNTS RECEIVABLE

ACCOUNTS RECEIVABLE

6. ACCOUNTS RECEIVABLE

Credit is extended based upon an evaluation of the customer's financial condition and, generally, collateral is not required.  Credit terms are consistent with industry standards and practices.  Trade accounts receivable at June 30, 2011 and December 31, 2010 have been reduced by an allowance for doubtful accounts of ($1,623,000) and ($1,601,000), respectively.