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Goodwill (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill        
Goodwill, beginning balance   $ 3,738,000    
Goodwill acquired during year   0   $ 0
Impairment losses $ (3,700,000) (3,738,000) $ 0 $ 0
Goodwill, ending balance $ 0 $ 0 $ 3,738,000