Bank Loans (Details 1) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Carrying amount that are repayable on demand or within twelve months from March 31, 2013 containing a repayable on demand clause:
Within twelve months	$ 1,539,802	$ 1,529,282
Carrying amount that are not repayable within twelve months from March 31, 2013 containing a repayable on demand clause but shown in current liabilities:
After 1 year, but within 2 years	1,810,458	2,142,751
After 2 years, but within 5 years	470,277	467,232
After 5 years	1,899,914	1,960,044
Long-term Debt, Excluding Current Maturities	4,180,649	4,570,027
Long-term Debt	$ 5,720,451	$ 6,099,309