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2. TRADE RECEIVABLES
6 Months Ended
Jun. 30, 2012
Schedule of Accounts and Notes Receivable [Text Block] (Deprecated 2009-01-31)
2. TRADE RECEIVABLES

Trade receivables are presented net of the related allowance for uncollectible accounts of approximately $519,000, $556,000 and $618,000 at June 30, 2012, December 31, 2011 and June 30, 2011, respectively. The allowance for uncollectible accounts is calculated based on the relative age and size of trade receivable balances. Our credit policy generally provides that trade receivables will be deemed uncollectible and written-off once we have pursued all reasonable efforts to collect on the account.