4. Concentrations of Business and Credit Risk (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Concentration Risk, Percentage	10.00%
Receivable with Imputed Interest, Effective Yield (Interest Rate)	8.00%	8.00%
Huge Power Int'l S.A. (the "Note") [Member]
Fair Value, Concentration of Risk, Notes Receivable (in Dollars)	4,000,000
Receivable with Imputed Interest, Effective Yield (Interest Rate)	8.00%
Concentration Risk, Cash and Cash Equivalents [Member]
Concentration Risk, Other Risk	Cash and cash equivalents The Company maintains certain bank accounts in the PRC which are not protected by Federal Deposit Insurance Corporation ("FDIC") insurance or other insurance. The cash balance held in the PRC banks was $40,394,459 and $14,859,542 as of December 31, 2012 and 2011, respectively. As of December 31, 2012 and 2011, the Company held $30,851 and $494,340 of cash balances within the United States of which nil and $241,676 were in excess of insurance limits of FDIC, respectively. As of December 31, 2012 and 2011 substantially all of the Group's cash and cash equivalents, restricted cash,investment in mutual funds and notes receivable were held by major financial institutions located in the PRC and the United States which management believes are of high credit quality.
Other Receivable [Member]
Concentration Risk, Other Risk	Trade receivables All of the Group's sales arose in the PRC. Accordingly, the Group is susceptible to fluctuations in its business caused by adverse economic conditions in the PRC. All of the Group's customers are located in the PRC. The Group provides credit in the normal course of business. The Group performs ongoing credit evaluations of its customers and maintains allowances for doubtful accounts based on factors surrounding the credit risk of specific customers, historical trends, and other information. One individual customer (2011 and 2010: two individual customers) accounted for more than 10% of trade receivables during the years ended December 31, 2012, 2011 and 2010.
Note Receivable [Member]
Concentration Risk, Other Risk	Notes receivable Notes receivable includes a promissory note in the principal amount of $4,000,000 (the "Note") issued by Huge Power Int'l S.A., a company organized in Samoa ("Huge Power"). On June 27, 2007, the Company loaned a principal amount of $4,000,000 to Huge Power and Huge Power issued the Note. The Note's stated interest is an annual rate of 8%, payable in cash semi-annually. The Note matured on June 27, 2009. Huge Power has made payments of interest under the Note; however, the Company has been unable to obtain the collateral that is required to be pledged according to the Note agreement. As a result, the Company has provided a full allowance for doubtful collection of the Note as a result of not receiving collateral. Interest on the Note is recognized when received due to the doubtful collection.
People's Republic of China (PRC) [Member]
Concentration Risk, Credit Risk, Uninsured Deposits	$40,394,459	$14,859,542
United States of America (USA) [Member]
Concentration Risk, Credit Risk, Uninsured Deposits	nil	$241,676
Deposits (in Dollars)	30,851	494,340