Summarized Financial Information of Reportable Segments (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Operating revenues, net:
- Products	$ 1,553,641	$ 1,420,387	$ 3,168,752	$ 2,302,350
- Services	43,832	55,029	177,647	471,679
Total operating revenues	1,597,473	1,475,416	3,346,399	2,774,029
Cost of revenues	1,492,399	1,044,491	2,835,564	1,932,129
Gross profit	105,074	430,925	510,835	841,900
Depreciation and amortization	208,252	211,743	417,921	413,720
Total assets	43,579,166	44,936,853	43,579,166	44,936,853	42,676,193
Expenditure for long-lived assets	104,669	723,100	105,842	942,060
Heavy Manufacturing Business
Operating revenues, net:
- Products	1,553,641	1,420,387	3,168,752	2,302,350
- Services	43,832	55,029	177,647	471,679
Total operating revenues	1,597,473	1,475,416	3,346,399	2,774,029
Cost of revenues	1,492,399	1,044,491	2,835,564	1,932,129
Gross profit	105,074	430,925	510,835	841,900
Depreciation and amortization	208,252	211,743	417,921	413,720
Total assets	43,579,166	44,936,853	43,579,166	44,936,853
Expenditure for long-lived assets	104,669	723,100	105,842	942,060
Energy Saving Related Business
Operating revenues, net:
- Products	0	0	0	0
- Services	0	0	0	0
Total operating revenues	0	0	0	0
Cost of revenues	0	0	0	0
Gross profit	0	0	0	0
Depreciation and amortization	0	0	0	0
Total assets	0	0	0	0
Expenditure for long-lived assets	$ 0	$ 0	$ 0	$ 0