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Note 3 - Investments - Available-for-sale Investments (Details) | Jun. 30, 2022 USD ($)
--- | ---
Fair value | $ 28,888
Short-term Investment [Member] |
Gross unrealized gains | 1,000
Gross unrealized losses | 69,000
Long-term Investment [Member] |
Gross unrealized gains | 1,000
Gross unrealized losses | 1,173,000
Short-term Certificates of Deposit [Member] |
Amortized cost | 3,962,000
Gross unrealized gains | 1,000
Gross unrealized losses | 69,000
Fair value | 3,894,000
Short-term Investment [Member] |
Amortized cost | 3,962,000
Fair value | 3,894,000
US Treasury Securities [Member] |
Amortized cost | 16,167,000
Gross unrealized gains | 0
Gross unrealized losses | 825,000
Fair value | 15,342,000
Long-term Certificates of Deposit [Member] |
Amortized cost | 10,000,000
Gross unrealized gains | 1,000
Gross unrealized losses | 348,000
Fair value | 9,652,000
Long-term Investment [Member] |
Amortized cost | 26,167,000
Fair value | $ 24,994,000

X
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