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Marketable Securities (Details - Marketable Securities) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 USD ($)
Net Investment Income [Line Items] |
Adjusted Cost | $ 105,977
Fair Value | 101,301
Unrealized Loss | (4,676)
Corporate Bond Securities [Member] |
Net Investment Income [Line Items] |
Adjusted Cost | 46,100
Fair Value | 44,232
US Treasury Securities [Member] |
Net Investment Income [Line Items] |
Adjusted Cost | 24,345
Fair Value | 23,394
Unrealized Loss | (951)
Collateralized Mortgage-Backed Securities [Member] |
Net Investment Income [Line Items] |
Adjusted Cost | 6,981
Fair Value | 6,653
Unrealized Loss | (329)
U S Agency And Government Sponsored Securities [Member] |
Net Investment Income [Line Items] |
Adjusted Cost | 14,095
Fair Value | 13,239
Unrealized Loss | (855)
US Treasury Notes Securities [Member] |
Net Investment Income [Line Items] |
Adjusted Cost | 11,854
Fair Value | 11,219
Unrealized Loss | (635)
Asset-Backed Securities [Member] |
Net Investment Income [Line Items] |
Adjusted Cost | 2,602
Fair Value | 2,564
Unrealized Loss | $ (38)

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