Pension and Other Postretirement Benefits (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
US Plan [Member]
Change in projected benefit obligation
Projected benefit obligation at beginning of year	$ 3,829,727	$ 3,176,669
Service cost		21,100	21,200
Interest cost	166,534	172,221	174,649
Benefit payments	(257,958)	(72,132)
Administrative expenses	(28,019)	(24,669)
Actuarial (gain) loss	389,763	556,538
Plan amendments
Settlements
Projected benefit obligation at end of year	4,100,047	3,829,727	3,176,669
Change in plan assets
Fair value of plan assets at beginning of year	2,067,871	1,835,326
Actual return on plan assets	227,201	117,350
Benefit payments	(257,958)	(72,132)
Employer contribution	239,830	211,996
Administrative expenses	(28,019)	(24,669)
Fair value of plan assets at end of year	2,248,925	2,067,871	1,835,326
Plan assets (less) greater than benefit obligation	(1,851,122)	(1,761,856)
Canadian Plan [Member]
Change in projected benefit obligation
Projected benefit obligation at beginning of year	1,441,482	1,262,526
Interest cost	58,812	76,866	78,845
Benefit payments	(94,119)	(94,262)
Actuarial (gain) loss	60,912	227,666
Plan amendments
Currency translation adjustment	33,450	(31,314)
Settlements
Projected benefit obligation at end of year	1,500,537	1,441,482	1,262,526
Change in plan assets
Fair value of plan assets at beginning of year	1,212,167	1,203,920
Actual return on plan assets	58,042	44,198
Benefit payments	(94,119)	(94,262)
Employer contribution	83,387	83,036
Currency translation adjustment	28,203	(24,725)
Fair value of plan assets at end of year	1,287,679	1,212,167	1,203,920
Plan assets (less) greater than benefit obligation	$ (212,858)	$ (229,316)