3. Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets:
Notes receivable	$ 651	$ 980
Liabilities:
Bank acceptance payable	1,445	1,271
Fair Value, Measurements, Recurring [Member]
Assets:
Cash and cash equivalents	9,909	32,175
Restricted cash	10,041	509
Short term investments	8,190	8,189
Notes receivable	651	980
Total assets	28,791	41,853
Liabilities:
Bank acceptance payable	1,445	1,271
Total liabilities	1,445	1,271
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Assets:
Cash and cash equivalents	9,909	32,175
Restricted cash	10,041	509
Short term investments	8,190	8,189
Notes receivable	0	0
Total assets	28,140	40,873
Liabilities:
Bank acceptance payable	0	0
Total liabilities	0	0
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Assets:
Cash and cash equivalents	0	0
Restricted cash	0	0
Short term investments	0	0
Notes receivable	651	980
Total assets	651	980
Liabilities:
Bank acceptance payable	1,445	1,271
Total liabilities	1,445	1,271
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Assets:
Cash and cash equivalents	0	0
Restricted cash	0	0
Short term investments	0	0
Notes receivable	0	0
Total assets	0	0
Liabilities:
Bank acceptance payable	0	0
Total liabilities	$ 0	$ 0

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Carrying amount as of the balance sheet date of drafts and bills of exchange that have been accepted by the reporting bank, or by others for its own account, as its liability to holders of the drafts.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value of financial and nonfinancial obligations.

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An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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