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2. TRADE RECEIVABLES
6 Months Ended
Jun. 30, 2013
Policy Text Block [Abstract]  
Trade and Other Accounts Receivable, Policy [Policy Text Block]
2. TRADE RECEIVABLES

Trade receivables are presented net of the related allowance for uncollectible accounts of approximately $820,000, $650,000 and $519,000 at June 30, 2013, December 31, 2012 and June 30, 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.