Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2012
Income Taxes [Abstract]
Proceeds from sale of common stock							$ 22,500,000
Net operating loss carry forwards		$ 23,059,000				$ 23,059,000
Carryforwards utilize limit before the stock offering closed						163,000
Unutilized operating loss carryforwards that will expire		20,520,000				20,520,000
Reduced deferred tax assets and valuation allowance		6,977,000				6,977,000
Statutory income tax rate	21.00%		34.00%	21.00%	34.00%
Additional bad debt deductions (expense)						2,250,000
Impact of new taxes on bad debt expense		979,000
Deferred tax liability not recorded		473,000				473,000
Deferred tax asset	$ 1,600,000	1,600,000		$ 1,600,000		1,600,000
Unrecognized Tax Benefits	$ 0	$ 0		$ 0		$ 0
Effective tax rate	18.40%		32.60%	19.10%	33.00%