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(1) Summary of Significant Accounting Policies (Details - Options outstanding and exercisable) - shares
shares in Thousands
Jun. 30, 2022
Dec. 31, 2021
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 11,400 13,075
Number of shares, exercisable 7,185 9,685
$0.95 - $1.99 [Member]    
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 32 577
Number of shares, exercisable 32 577
$2.00 - $2.99 [Member]    
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 1,453 1,517
Number of shares, exercisable 783 489
$3.00 - $3.99 [Member]    
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 3,952 4,285
Number of shares, exercisable 3,367 3,382
$4.00 - $4.99 [Member]    
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 2,745 2,870
Number of shares, exercisable 1,495 1,410
$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 753 2,651
Number of shares, exercisable 753 2,652
$7.00 - $7.99 [Member]    
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 755 1,175
Number of shares, exercisable 755 1,175
$8.00 - $11.00 [Member]    
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 1,710 0
Number of shares, exercisable 0 0