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Disposition of Assets (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Income Statement [Abstract]          
Loss from discontinued operation, net of income taxes $ 0 $ (523,000) $ 0 $ (1,010,000)  
From discontinued operation (in US dollars per share) $ 0 $ (0.01) $ 0 $ (0.02)  
UNITED KINGDOM | Discontinued Operations [Member] | United Kingdom Construction [Member]          
Income Statement [Abstract]          
Revenues   $ 0   $ 0  
Loss from discontinued operation, net of income taxes   $ (523,000)   $ (1,010,000)  
From discontinued operation (in US dollars per share)   $ (0.01)   $ (0.02)  
Current liabilities $ 0   $ 0   $ 3,700,000