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Marketable Securities (Details - Marketable Securities) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2021
Net Investment Income [Line Items] |  |
Adjusted Cost | $ 97,530 | $ 113,778
Unrealized Loss | (7,657) | (1,255)
Fair Value | 89,873 | 112,523
Corporate Bond Securities [Member] |  |
Net Investment Income [Line Items] |  |
Adjusted Cost | 44,822 | 47,864
Unrealized Loss | (2,968) | (529)
Fair Value | 41,854 | 47,335
US Treasury Securities [Member] |  |
Net Investment Income [Line Items] |  |
Adjusted Cost | 20,922 | 24,410
Unrealized Loss | (1,437) | (257)
Fair Value | 19,485 | 24,153
Collateralized Mortgage-Backed Securities [Member] |  |
Net Investment Income [Line Items] |  |
Adjusted Cost | 6,285 | 7,504
Unrealized Loss | (760) | (143)
Fair Value | 5,525 | 7,361
U S Agency And Government Sponsored Securities [Member] |  |
Net Investment Income [Line Items] |  |
Adjusted Cost | 13,116 | 14,675
Unrealized Loss | (1,495) | (87)
Fair Value | 11,621 | 14,588
US Treasury Notes Securities [Member] |  |
Net Investment Income [Line Items] |  |
Adjusted Cost | 11,818 | 11,871
Unrealized Loss | (988) | (189)
Fair Value | 10,830 | 11,682
Asset-Backed Securities [Member] |  |
Net Investment Income [Line Items] |  |
Adjusted Cost | 567 | 6,456
Unrealized Loss | (9) | (50)
Fair Value | $ 558 | 6,406
Commercial Paper [Member] |  |
Net Investment Income [Line Items] |  |
Adjusted Cost |  | 998
Unrealized Loss |  | 0
Fair Value |  | $ 998

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