Property And Equipment (Schedule Of Property And Equipment) (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 11,084,313	$ 10,896,597
Less: Accumulated depreciation	(10,007,621)	(10,001,869)
Net property and equipment	1,076,692	894,728
Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	8,452,520	8,264,804
Equipment Held For Lease [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	303,412	303,412
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 2,328,381	$ 2,328,381