ACCOUNTING POLICIES (Details 2) (USD $)	9 Months Ended
	Sep. 30, 2012 item	Dec. 31, 2011 item
Allowance for doubtful accounts
Normal credit term granted to customers	30 days
Allowance for doubtful accounts receivable	$ 738,000	$ 574,000
Concentration of credit risk
Number of banks who hold majority of cash and cash equivalents	2	2
Prepaid inventories, net
Prepaid inventories	1,668,000	1,027,000
Prepaids and other assets
Total prepaids and other assets	$ 13,550,000	$ 12,651,000