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Pension and Other Postretirement Benefits (Details 4) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
US Plan [Member]
Fair value hierarchy of plan assets
Fair value of plan assets	$ 2,248,925	$ 2,067,871	$ 1,835,326
Canadian Plan [Member]
Fair value hierarchy of plan assets
Fair value of plan assets	1,287,679	1,212,167	1,203,920
Cash and cash equivalents [Member] \| US Plan [Member] \| Level 1 [Member]
Fair value hierarchy of plan assets
Fair value of plan assets	261,655
Cash and cash equivalents [Member] \| Canadian Plan [Member] \| Level 1 [Member]
Fair value hierarchy of plan assets
Fair value of plan assets	50,329
Mutual funds [Member] \| US Plan [Member] \| Level 1 [Member]
Fair value hierarchy of plan assets
Fair value of plan assets	254,580
Mutual funds [Member] \| Canadian Plan [Member] \| Level 1 [Member]
Fair value hierarchy of plan assets
Fair value of plan assets	1,237,350
Corporate/Government Bonds [Member] \| US Plan [Member] \| Level 1 [Member]
Fair value hierarchy of plan assets
Fair value of plan assets	693,950
Equities [Member] \| US Plan [Member] \| Level 1 [Member]
Fair value hierarchy of plan assets
Fair value of plan assets	$ 1,038,740

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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