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(1) Summary of Significant Accounting Policies (Details - Options outstanding and exercisable) - shares
shares in Thousands
Sep. 30, 2021
Dec. 31, 2020
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 14,311 15,977
Number of shares, exercisable 10,916 12,597
$0.95 - $1.99 [Member]    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 1,257 1,904
Number of shares, exercisable 1,257 1,904
$2.00 - $2.99 [Member]    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 1,525 1,570
Number of shares, exercisable 497 180
$3.00 - $3.99 [Member]    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 4,479 4,973
Number of shares, exercisable 3,572 3,306
$4.00 - $4.99 [Member]    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 2,925 1,540
Number of shares, exercisable 1,465 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 2,935 4,770
Number of shares, exercisable 2,935 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