Accumulated Other Comprehensive Loss (Summary Of Changes In Accumulated Other Comprehensive Loss) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Accumulated Other Comprehensive Income Loss [Line Items]
Amortization of prior service cost	$ 4,367		$ 4,367
Amortization of net loss	165,884		123,098
Beginning Balance	(2,422,109)	[1]	(2,442,997)
Amounts reclassified from AOCL	170,251		127,465
Ending Balance	(2,251,858)		(2,315,532)
Prior Service Cost [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(34,936)		(52,405)
Amortization of prior service cost	4,367		4,367
Ending Balance	(30,569)		(48,038)
Net Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(2,387,173)		(2,390,592)
Amortization of net loss	165,884		123,098
Ending Balance	$ (2,221,289)		$ (2,267,494)

[1] The balance sheet at December 31, 2012, has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.