Pension and Other Postretirement Benefits (Details 2) (USD $)	Dec. 31, 2012	Dec. 31, 2011
US Plan [Member]
Summary of amount in accumulated other comprehensive loss
Unrecognized net loss	$ 1,636,551	$ 1,413,239
Net amount recognized	1,636,551	1,413,239
Canadian Plan [Member]
Summary of amount in accumulated other comprehensive loss
Unrecognized net loss	599,824	544,514
Net amount recognized	$ 599,824	$ 544,514