Note 5 - Accounts receivable, net (Detail) - Accounts receivable, net (USD $)	Sep. 30, 2012	Dec. 31, 2011
Accounts receivable	$ 12,284,000	$ 6,546,000
Allowance for doubtful debts	(2,462,000)	(2,102,000)
Accounts receivable, net	$ 9,822,000	$ 4,444,000