ACCOUNTING POLICIES (Details 2) (USD $)	3 Months Ended
	Mar. 31, 2013 item	Dec. 31, 2012 item
Allowance for doubtful accounts
Normal credit term granted to customers	30 days
Allowance for doubtful accounts receivable	$ 875,000	$ 797,000
Concentration of credit risk
Number of banks who hold majority of cash and cash equivalents	2	2
Prepaid inventories, net
Prepaid inventories	1,988,000	1,912,000
Prepaids and other assets
Total prepaids and other assets	$ 10,589,000	$ 12,897,000