CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash	$ 312,448	$ 380,579
Restricted cash	6,933,120	6,469,826
Bank notes receivable	542,559	1,695,771
Accounts receivable (net of allowance of $1,489,462 and $1,481,307 at March 31, 2013 and December 31, 2012, respectively)	33,030,935	42,214,102
Retentions receivable (net of allowance of $534,128 and $531,203 at March 31, 2013 and December 31, 2012, respectively)	13,949,688	13,237,473
Prepaid expenses and deposits	5,477,175	7,613,579
Other receivables	8,867,697	3,005,423
Inventories	30,896,916	25,555,534
Total current assets	100,010,538	100,172,287
Long-term retentions receivable (net of allowance of $1,179,317 and $1,172,860 at March 31, 2013 and December 31, 2012, respectively)	1,468,441	2,495,618
Plant and equipment, net	16,140,827	16,505,421
Construction in progress	1,001,242	690,655
Land use rights, net	2,349,448	2,258,796
Long-term investment	0	158,702
Total assets	120,970,496	122,281,479
Current liabilities:
Short-term loans	28,956,691	24,037,073
Bank notes payable	2,473,431	2,221,834
Accounts payable and accrued expenses	13,566,480	19,662,185
Advances from customers	15,173,431	14,535,685
Salaries payable	928,221	401,536
Taxes payable	3,328,582	5,215,355
Related party payables	194,683	407,767
Loans payable to employees	1,177,794	2,027,032
Loans payable to other individuals	3,510,676	4,372,570
Other payable	7,864,076	3,582,618
Total current liabilities	77,174,065	76,463,655
Deferred income	2,761,630	2,776,599
Long-term loans	547,346	622,114
Total liabilities	80,483,041	79,862,368
Commitments and contingencies (Note 14)
Stockholders' equity:
Series A preferred stock, $0.0001 par value; 20,000,000 shares authorized; zero shares issued and outstanding	0	0
Common stock, $0.0001 par value; 100,000,000 shares authorized; 19,995,701 issued and outstanding at March 31, 2013 and December 31, 2012	2,000	2,000
Additional paid-in capital	2,661,026	2,661,026
Statutory reserve	1,385,966	1,385,966
Retained earnings	34,185,260	36,346,896
Accumulated other comprehensive income	2,253,203	2,023,223
Total stockholders' equity	40,487,455	42,419,111
Total liabilities and stockholders' equity	$ 120,970,496	$ 122,281,479