Annual report pursuant to Section 13 and 15(d)

Supplementary Information For Statement of Cash Flows (Details)

v3.8.0.1
Supplementary Information For Statement of Cash Flows (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Supplementary Information For Statement of Cash Flows        
Cash and cash equivalents $ 3,879,000 $ 1,552,000 $ 1,442,000  
Restricted cash 7,558,000 7,557,000 7,557,000  
Total $ 11,437,000 $ 9,109,000 $ 8,999,000 $ 10,660,000