Note 7 - Other receivables, net (Detail) - Other receivables, net (USD $)	Mar. 31, 2013	Dec. 31, 2012
Allowance for doubtful debts	$ (420,000)	$ (158,000)
Other receivables, net	3,128,000	3,103,000
Short-term loans to unrelated entities	478,000	475,000
Term deposit interest receivable	89,000	59,000
Short-term Loan [Member]
Other receivables, gross	2,388,000	2,375,000
Staff Advances [Member]
Other receivables, gross	173,000	194,000
Overdue Contract Execution Deposits [Member]
Other receivables, gross	$ 420,000	$ 158,000