Pension and Other Postretirement Benefits (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
U.S. Plan [Member]
Components of net periodic benefit cost
Service cost		$ 21,100	$ 21,200
Interest cost	166,534	172,221	174,649
Expected return on plan assets	(154,411)	(142,104)	(132,093)
Net actuarial loss	93,661	51,287	42,191
Net periodic benefit cost	105,784	102,504	105,947
Canadian Plan [Member]
Components of net periodic benefit cost
Interest cost	58,812	76,866	78,845
Expected return on plan assets	(73,715)	(84,452)	(81,273)
Amortization of prior service cost	34,007	15,070	7,380
Net periodic benefit cost	$ 19,104	$ 7,484	$ 4,952