Product Warranty Provisions (Schedule Of Accrued Warranty) (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Product Warranty Provisions [Abstract]
Warranty accrual, beginning of the fiscal period	$ 501,212	$ 653,473
Accrual adjustment for product warranty	(34,553)	84,562
Payments made	(16,941)	(236,823)
Warranty accrual, end of the fiscal period	$ 449,718	$ 501,212
Standard product warranty, coverage term	1 year