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Summary of Significant Accounting Policies (Details - Options outstanding and exercisable) - shares
shares in Thousands
Mar. 31, 2024
Dec. 31, 2023
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 7,945 8,125
Number of shares, exercisable 6,070 6,062
$2.00 - $2.99 [Member]    
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 1,410 1,410
Number of shares, exercisable 1,083 1,082
$3.00 - $3.99 [Member]    
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 2,383 2,473
Number of shares, exercisable 2,383 2,473
$4.00 - $4.99 [Member]    
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 2,450 2,539
Number of shares, exercisable 1,839 1,929
$6.00 - $6.99 [Member]    
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 0 0
Number of shares, exercisable 0 0
$7.00 - $7.99 [Member]    
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 0 0
Number of shares, exercisable 0 0
$10.00 - $10.99 [Member]    
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number of shares, outstanding 1,702 1,703
Number of shares, exercisable 765 578