Quarterly report pursuant to Section 13 or 15(d)

CASH AND CASH EQUIVALENTS, AND OTHER INVESTMENTS (Details)

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CASH AND CASH EQUIVALENTS, AND OTHER INVESTMENTS (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Cash and cash equivalents:        
Cash $ 8,906,000 $ 7,514,000    
Money market funds 21,796,000 43,337,000    
Certificates of deposit (3 months or less maturity) 2,257,000 250,000    
Total Cash and cash equivalents 32,959,000 51,101,000 $ 51,895,000 $ 50,918,000
Other Investments        
Certificates of deposit (greater than 3 months up 12 months maturity) 9,487,000 2,000,000    
Short term bond funds 13,366,000    
Corporate bonds 4,144,000 1,054,000    
Total other investments 26,997,000 3,054,000    
Total cash and cash equivalents and other investments $ 59,956,000 $ 54,155,000