G. Fair Value of Financial Instruments (Details-Summary) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets:
Cash and cash equivalents	$ 28,074	$ 32,175
Restricted cash	4,719	509
Short term investments	7,886	9,169
Total assets	40,679	41,853
Liabilities:
Bank acceptance payable	2,998	1,271
Total liabilities	2,998	1,271
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash and cash equivalents	28,074	32,175
Restricted cash	4,719	509
Short term investments	7,886	8,189
Total assets	40,679	40,873
Liabilities:
Bank acceptance payable	0	0
Total liabilities	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash and cash equivalents	0	0
Restricted cash	0	0
Short term investments	0	980
Total assets	0	980
Liabilities:
Bank acceptance payable	2,998	1,271
Total liabilities	2,998	1,271
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash and cash equivalents	0	0
Restricted cash	0	0
Short term investments	0	0
Total assets	0	0
Liabilities:
Bank acceptance payable	0
Total liabilities	$ 0	$ 0