Annual report pursuant to Section 13 and 15(d)

Supplementary Information For Statement of Cash Flows (Details)

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Supplementary Information For Statement of Cash Flows (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Supplementary Information For Statement of Cash Flows        
Cash and cash equivalents $ 6,372,000 $ 3,879,000    
Restricted cash 7,458,000 7,558,000    
Total $ 13,830,000 $ 11,437,000 $ 9,109,000 $ 8,999,000