Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Cash, Cash Equivalents and Investments - Investments (Details)

v3.23.1
Note 5 - Cash, Cash Equivalents and Investments - Investments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Amortized cost $ 8,640  
Unrealized gains 0  
Unrealized losses (3)  
Fair value 8,637  
US Treasury Securities [Member]    
Amortized cost 2,377  
Unrealized gains 0  
Unrealized losses 0  
Fair value $ 2,377 $ 3,573
US Treasury Securities [Member] | Minimum [Member]    
Contractual Maturity Period (Day) 20 days  
US Treasury Securities [Member] | Maximum [Member]    
Contractual Maturity Period (Day) 111 days  
Corporate Bond Securities [Member]    
Amortized cost $ 6,263  
Unrealized gains 0  
Unrealized losses (3)  
Fair value $ 6,260 $ 15,566
Corporate Bond Securities [Member] | Minimum [Member]    
Contractual Maturity Period (Day) 4 days  
Corporate Bond Securities [Member] | Maximum [Member]    
Contractual Maturity Period (Day) 138 days