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(1) Summary of Significant Accounting Policies (Details - Options outstanding and exercisable) - shares
shares in Thousands
Jun. 30, 2021
Dec. 31, 2020
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 15,119 15,977
Number of shares, exercisable 12,772 12,597
$0.95 - $1.99 [Member]    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 1,390 1,904
Number of shares, exercisable 1,390 1,904
$2.00 - $2.99 [Member]    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 1,570 1,570
Number of shares, exercisable 528 180
$3.00 - $3.99 [Member]    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 4,774 4,973
Number of shares, exercisable 3,469 3,306
$4.00 - $4.99 [Member]    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 1,510 1,540
Number of shares, exercisable 1,510 1,217
$5.00 - $5.99 [Member]    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 0 0
Number of shares, exercisable 0 (0)
$6.00 - $6.99 [Member]    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 4,685 4,770
Number of shares, exercisable 4,685 4,770
$7.00 - $7.99 [Member]    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 1,190 1,220
Number of shares, exercisable 1,190 1,220