3. Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Liabilities:
Bank acceptance payable	$ 2,377	$ 2,347
Fair Value, Measurements, Recurring [Member]
Assets:
Short term investments	7,957	7,970
Total assets	7,957	7,970
Liabilities:
Bank acceptance payable	2,377	2,347
Total liabilities	2,377	2,347
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Short term investments	7,957	7,970
Total assets	7,957	7,970
Liabilities:
Bank acceptance payable	0	0
Total liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Short term investments	0	0
Total assets	0	0
Liabilities:
Bank acceptance payable	2,377	2,347
Total liabilities	2,377	2,347
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets:
Short term investments	0	0
Total assets	0	0
Liabilities:
Bank acceptance payable	0	0
Total liabilities	$ 0	$ 0