Income Taxes (Schedule Of Components Of Deferred Tax Asset) (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Current accruals	$ 1,718,808	$ 1,638,298
Deferred revenue	30,648	126,631
Depreciation and amortization	1,311,718	2,131,933
Deferred compensation	633,303	1,464,533
Net operating loss carryovers	22,359,693	33,943,745
Deferred tax assets	26,054,170	39,305,140
Valuation allowance	(25,955,759)	(39,000,095)
Net deferred tax assets before deferred tax liabilities	98,411	305,045
Accounting method changes	(98,411)	(305,045)
Net deferred tax assets