Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
Current Assets
Cash and cash equivalents	$ 2,544,567	$ 3,891,473
Restricted cash	5,047,052	8,873,999
Accounts receivable (net of allowance for doubtful accounts of $77,970 and $76,125 as of March 31, 2015 and December 31, 2014, respectively)	3,820,506us-gaap_AccountsReceivableNet	3,730,123us-gaap_AccountsReceivableNet
Inventories	10,931,611us-gaap_InventoryNet	7,139,599us-gaap_InventoryNet
Prepayments and other current assets	941,251	2,919,668
Deferred tax asset - non-current	6,018
Total current assets	23,291,005us-gaap_AssetsCurrent	26,554,862us-gaap_AssetsCurrent
Prepayment on property, plant and equipment	1,484,810us-gaap_PrepaidExpenseOtherNoncurrent	1,490,440us-gaap_PrepaidExpenseOtherNoncurrent
Property, plant, and equipment, net	209,095,769us-gaap_PropertyPlantAndEquipmentNet	208,213,198us-gaap_PropertyPlantAndEquipmentNet
Recoverable VAT	3,089,938	3,228,075
Deferred tax asset - non-current	424,900	281,010
Total Assets	237,386,422us-gaap_Assets	239,767,585us-gaap_Assets
Current Liabilities
Short-term bank loans	9,768,487	9,805,524
Current portion of long-term loans from credit union	146,527us-gaap_LineOfCredit	147,083us-gaap_LineOfCredit
Current portion of long-term loan from a related party	2,377,962	2,386,978
Current obligations under capital lease	11,898,798us-gaap_CapitalLeaseObligationsCurrent	12,258,488us-gaap_CapitalLeaseObligationsCurrent
Accounts payable	839,255us-gaap_AccountsPayableCurrent
Notes payable	10,094,103us-gaap_NotesPayableCurrent	16,113,744us-gaap_NotesPayableCurrent
Due to a related party	267,741us-gaap_DueToRelatedPartiesCurrent	227,900us-gaap_DueToRelatedPartiesCurrent
Accrued payroll and employee benefits	354,644	492,765
Other payables and accrued liabilities	3,506,683	2,400,523
Income taxes payable	1,591,192us-gaap_AccruedIncomeTaxesCurrent	637,143us-gaap_AccruedIncomeTaxesCurrent
Total current liabilities	40,845,392us-gaap_LiabilitiesCurrent	44,470,148us-gaap_LiabilitiesCurrent
Loans from credit union	5,738,986us-gaap_OtherLoansPayableLongTerm	5,760,745us-gaap_OtherLoansPayableLongTerm
Loan from a related party	9,768,487us-gaap_DueToRelatedPartiesNoncurrent	9,805,524us-gaap_DueToRelatedPartiesNoncurrent
Deferred gain on sale-leaseback	577,302	695,389
Long-term obligations under capital lease	4,072,946	4,090,413
Total liabilities	61,003,113us-gaap_Liabilities	64,822,219us-gaap_Liabilities
Commitments and Contingencies
Stockholders' Equity
Common stock, 500,000,000 shares authorized, $0.001 par value per share, 20,316,400 shares issued and outstanding as of March 31, 2015 and December 31, 2014	20,316us-gaap_CommonStockValue	20,316us-gaap_CommonStockValue
Additional paid-in capital	49,218,982us-gaap_AdditionalPaidInCapital	49,218,982us-gaap_AdditionalPaidInCapital
Statutory earnings reserve	6,080,574us-gaap_RetainedEarningsAppropriated	6,080,574us-gaap_RetainedEarningsAppropriated
Accumulated other comprehensive income	16,353,619	17,021,165
Retained earnings	104,709,818us-gaap_RetainedEarningsUnappropriated	102,604,329us-gaap_RetainedEarningsUnappropriated
Total stockholders' equity	176,383,309us-gaap_StockholdersEquity	174,945,366us-gaap_StockholdersEquity
Total Liabilities and Stockholders' Equity	$ 237,386,422	$ 239,767,585

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant