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Summary of Significant Accounting Policies (Details - Options outstanding and exercisable) - shares
shares in Thousands
Mar. 31, 2023
Dec. 31, 2022
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 10,081 11,167
Number of shares, exercisable 6,871 7,770
Range 1 [Member]    
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 1,440 1,445
Number of shares, exercisable 770 775
$2.00 - $2.99 [Member]    
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 3,646 3,785
Number of shares, exercisable 3,356 3,495
$3.00 - $3.99 [Member]    
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 2,677 2,739
Number of shares, exercisable 1,740 1,802
$4.00 - $4.99 [Member]    
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 0 0
Number of shares, exercisable 0 0
$5.00 - $5.99 [Member]    
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 0 740
Number of shares, exercisable 0 740
$6.00 - $6.99 [Member]    
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 608 748
Number of shares, exercisable 608 748
$7.00 - $7.99 [Member]    
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 1,710 1,710
Number of shares, exercisable 397 210