Annual report pursuant to Section 13 and 15(d)

Income Taxes (Reconciliation of federal statutory income tax rate to our effective income tax rate) (Details)

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Income Taxes (Reconciliation of federal statutory income tax rate to our effective income tax rate) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Abstract]    
Computed expected tax expense $ (2,022,000) $ (3,235,000)
State taxes, net of federal benefit (447,000) (612,000)
Effect of tax rate changes on deferred tax assets and liabilities 7,657,000  
Expiration of NOL carryforwards 188,000 143,000
Other 37,000 17,000
Change in valuation allowance (5,413,000) 3,687,000
Total