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2. TRADE RECEIVABLES
3 Months Ended
Mar. 31, 2013
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 $697,000, $650,000 and $466,000 at March 31, 2013, December 31, 2012 and March 31, 2012, 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.