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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Investment in Joint Ventures) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]                      
Beginning balance       $ 37,973       $ 52,435 $ 37,973 $ 52,435  
Equity contributions in existing and purchase of interest in joint ventures                 103 2,000  
Equity in earnings in these joint ventures $ 2,278 $ 1,955 $ 2,244 $ 1,873 $ 1,830 $ 2,822 $ 3,748 $ 2,977 8,350 11,377 $ 13,554
Sale of ownership interest                 (134)    
Dissolution of GSRN                 (1,428)    
Nulogix return of capital                 (792) 0 0
Equity interest acquiree remeasurement loss                 (1,004) (2,993)  
Distribution of earnings                 (8,598) (24,846)  
Ending balance $ 34,470       $ 37,973       $ 34,470 $ 37,973 $ 52,435