SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Investment in Joint Ventures) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Roll Forward]
Beginning balance	$ 34,470	$ 37,973
Equity contributions in existing and purchase of interest in joint ventures	1,635	103
Equity in earnings in these joint ventures	7,945	8,350	$ 11,377
Sale of ownership interest		(134)
Dissolution of GSRN		(1,428)
Nulogix return of capital	0	(792)	0
Equity interest acquiree remeasurement loss		(1,004)
Distribution of earnings	(9,522)	(8,598)
Ending balance	$ 34,528	$ 34,470	$ 37,973