Comprehensive Income - Accumulated Comprehensive Income (Loss) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Accumulated other comprehensive income, beginning balance	$ (1,038,319)	$ (875,157)
Change in net prior service credit and actuarial losses, net of tax	57,191	66,691
Translation adjustment	194,235	(229,853)
Accumulated other comprehensive income, ending balance	(786,893)	(1,038,319)
Foreign Currency Translation Adjustment
Accumulated other comprehensive income, beginning balance	51,111	280,964
Translation adjustment	194,235	(229,853)
Accumulated other comprehensive income, ending balance	245,346	51,111
Net Prior Service Credit and Actuarial Losses
Accumulated other comprehensive income, beginning balance	(1,089,429)	(1,156,120)
Change in net prior service credit and actuarial losses, net of tax	57,191	66,691
Accumulated other comprehensive income, ending balance	$ (1,032,238)	$ (1,089,429)