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(1) Summary of Significant Accounting Policies (Details - Lease cost) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accounting Policies [Abstract]        
Operating lease cost $ 1,793 $ 1,885 $ 3,630 $ 3,769
Finance lease cost 308 293 616 572
Total lease cost $ 2,101 $ 2,178 $ 4,246 $ 4,341