Quarterly report pursuant to Section 13 or 15(d)

Note 3 - Investments - Available-for-sale Investments (Details)

v3.22.2
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